So you think hackers have stolen your password? You're not the only one. 
Perhaps you've noticed strange activity on your email account or frequent pop-ups on your computer. Perhaps it's just a hunch. 
But how can you know&nbsp;for sure?
There are many warning signs that you've been the victim of a data hack:
<ul>
<li>Your device is slower than normal.</li>
<li>You use more data than normal.</li>
<li>Videos take longer to load.</li>
<li>You received an email notification about a password change you didn't make.</li>
<li>An online account no longer accepts your password.</li>
</ul>
However, hackers can steal your passwords and identity&nbsp;without you ever knowing. That's why it's so difficult to tell if you're the victim of a hack.
This guide will help you work out if hackers have stolen your information and tell you how to stop it from happening again.&nbsp;
Prevent hackers from stealing your data by incorporating TeamPassword into your tech stack. This password manager for teams comes with a range of security features like two-step verification and password encryption.&nbsp;<a href="https://app.teampassword.com/dashboard#signup/testimonial" target="_blank" rel="noopener">Sign up for a free trial</a>&nbsp;today.&nbsp;

<h2>Have I Been Hacked? How Do I Know?</h2>
There are various ways to tell whether hackers have access to your information:
<ul>
<li>Look for unusual activity on your account. This activity includes logins to your social media accounts from unfamiliar locations or mass messages sent from your email account.&nbsp;</li>
<li>Look for security emails from account providers that warn about failed login attempts or password changes you didn't make.&nbsp;&nbsp;</li>
<li>Look for changes in performance on the devices, apps, and websites you use. For example, see if videos take longer to buffer than normal.&nbsp;</li>
<li>Look at your browser's password manager (if you use one) and check that nobody has changed these credentials.&nbsp;</li>
</ul>
All the above can be a guessing game. You might have a feeling that you're the victim of a hack but don't know for sure. 
Checking a stolen password list like "Have I Been Pwned" clears up some of the confusion. This tool searches across multiple data breaches &mdash; when hackers take stolen passwords and usernames and post them online &mdash; to see if cybercriminals have compromised your personal information. 
Here's how to use this stolen password list:
<ol>
<li>Enter your email address on the main page.&nbsp;</li>
<li>Click "pwned."</li>
<li>The website will search thousands of databases to see if hackers have stolen your personal information.</li>
<li>If you receive the "Oh no &ndash; Pwned!" message, it means hackers have posted sensitive information associated with your email address (passwords, addresses, phone numbers, etc.) somewhere online.</li>
<li>If you receive the "Good news &ndash; no pwnage found!" message, it means the website could not find your information on the internet.&nbsp;</li>
</ol>
Note: Just because the website can't find your data on the internet, it doesn't mean hackers haven't compromised your personal information.
Read more:&nbsp;<a href="https://teampassword.com/blog/password-manager-for-small-businesses" target="_blank" rel="noopener">Password Manager for Small Businesses</a>

<h2>Which Passwords Did Hackers Steal?</h2>
Establish which passwords hackers stole in a data breach so you can take quick action. Websites like "Have I Been Pwned"&nbsp;won't&nbsp;tell you which passwords are at risk. You'll only learn whether hackers have compromised the data associated with a particular email address. 
Note: Sometimes, hackers might have access to your email address and other personal information but not your password. It's hard to know for sure.&nbsp;
If hackers have access to your data, it's a good idea to change&nbsp;all passwords&nbsp;associated with the compromised email address. If you use your email address for several online accounts, change the passwords for these services. Updating these passwords might take you a while, and remembering the new passwords leads to additional problems. (Keep reading to find a solution.)
Here are some other tips:
<ul>
<li>When choosing new passwords, use combinations of lowercase letters, uppercase letters, numbers, and symbols. Passwords that use all these elements are stronger than those that don't.</li>
<li>Don't write your passwords down because this increases the risk of identity theft.&nbsp;&nbsp;</li>
<li>Don't tell anyone your new passwords.</li>
</ul>
Read more:&nbsp;<a href="https://teampassword.com/blog/the-most-secure-way-to-share-passwords" target="_blank" rel="noopener">The Most Secure Way to Share Passwords</a>.

<h2>How Common Is a Data Hack?</h2>
More common than you think. Hackers were responsible for more than 4,000 attacks every day in 2020, and the total number of compromised records exceeded 37 billion. That's a 141% increase from 2019. Much of this compromised data appears on the dark web, where cybercriminals use it to facilitate illegal activities such as identity theft and money laundering.&nbsp;
If you have been the subject of a data hack, you are not alone. However, it's important to act quickly to prevent hackers from accessing your personal or financial accounts.&nbsp;
There are other types of cybercrime to consider. Cybercriminals use techniques like phishing, where they impersonate people online and trick victims into handing over their personal information. Phishing now accounts for more than 80% of all cybersecurity incidents, and criminals steal $17,700 every minute in these attacks.&nbsp;

<h2>What Kind of Information Do Hackers Steal?</h2>
Hackers steal all kinds of personal and financial information:
<ul>
<li>Names</li>
<li>Email addresses</li>
<li>Usernames</li>
<li>Passwords</li>
<li>Addresses</li>
<li>Phone numbers</li>
<li>Bank account details</li>
<li>Credit card numbers</li>
<li>Social Security numbers</li>
<li>Insurance information&nbsp;</li>
<li>IRS information</li>
<li>Photos</li>
<li>Private message</li>
<li>SMS messages</li>
</ul>
Nothing is off-limits for hackers, and these criminals go to great lengths to steal your data. Once they have access to the information above, hackers can transfer money from your bank accounts, use your identity to apply for financing, and damage your credit file.&nbsp;
Read more:&nbsp;<a href="https://teampassword.com/blog/the-scariest-data-breaches-of-all-time" target="_blank" rel="noopener">The Scariest Data Breaches of All Time</a>.
TeamPassword is the best password manager for teams. Features include two-step verification, password encryption, easy password sharing, and more.&nbsp;<a href="https://app.teampassword.com/dashboard#signup/testimonial" target="_blank" rel="noopener">Get a free trial now</a>&nbsp;and learn how TeamPassword keeps you safe online.&nbsp;

<h2>Have I Been Hacked? How to Stay Safe.</h2>
There are several ways to improve online security and prevent hackers from accessing your personal information:
<ul>
<li>Use the latest security software and apps when using devices and browsing the internet.</li>
<li>Carry out regular risk assessments where you evaluate your security software.</li>
<li>Back up personal data to a reputable cloud service instead of keeping it on your device.&nbsp;</li>
<li>Don't share personal information with other people.</li>
<li>Create a security management strategy for your organization and share it with all team members.&nbsp;</li>
</ul>
Using a password manager is another way to stay safe online. The best ones encrypt your online passwords so hackers can't access these credentials, and you can keep passwords in a secure cloud-based vault and not have to remember them. There are various password managers online, including free ones available through most internet browsers, but not all tools are the same.&nbsp;
If you work alongside a team, consider TeamPassword. It's the&nbsp;<a href="https://www.teampassword.com/" target="_blank" rel="noopener">password manager for teams</a>&nbsp;that require world-class security and performance. This all-in-one password solution helps teams like yours store, manage, and share passwords in the safest way possible.&nbsp;

<h2>How Can TeamPassword Help?</h2>
TeamPassword prevents hackers from stealing your organization's most sensitive data with an incredible range of password management features. Enterprises of all sizes use TeamPassword to manage passwords, including tech startups, digital marketing agencies, creative agencies, and software and development teams.
Here are some&nbsp;<a href="https://teampassword.com/features" target="_blank" rel="noopener">TeamPassword features</a>&nbsp;that prevent situations involving a stolen password:
<ul>
<li>Random password generation that creates unique passwords for websites.</li>
<li>Two-step password verification.</li>
<li>Activity and logging tools so you can discover who has access to password management features.</li>
<li>Secure encryption technology.</li>
<li>Email notifications about password management actions.</li>
<li>Passwords stored securely in one place. </li>
</ul>
<h2>Final Word</h2>
If you're looking for the answer to the question, "Have I been hacked?" it's difficult to know for sure. Preventing hackers from compromising your data in the first place provides a better resolution. TeamPassword lets you store and manage passwords in a secure environment and minimize the effects of a stolen password so you can avoid hackers stealing your data and continue to collaborate on team projects.&nbsp;
With features like password encryption, two-step authentication, and random password generation, TeamPassword is the best password management solution for teams that want to improve online security.&nbsp;<a href="https://app.teampassword.com/dashboard#signup/testimonial" target="_blank" rel="noopener">Sign up for a free trial</a>&nbsp;now.

Have I been hacked? Here's how to check if you have and learn how to stop hackers from stealing your data. | TeamPassword Blog

Have I been hacked? Here's how to check if you have and learn how to stop hackers from ...

Have I Been Hacked? How to Know for Sure.

I remember having a conversation with a friend many, many years ago, back when the world wide web was still in its infancy and most people were just buying their first family computer. Back in the halcyon days.
We were talking about passwords, and my friend volunteered proudly that his password was &ldquo;appletree&rdquo;, he thought it was brilliant. He used it everywhere, he never forgot it. If he ever had to update his password and was restricted from using the previous one, he simply used &ldquo;peartree&rdquo; instead. Simple.
You might think that in 2024, this is an absurd thing to bring up. We&rsquo;ve all changed. We&rsquo;ve got wiser to the dangers of the modern world. Applications and websites no longer let you enter passwords as simple as this anyway. We now use stronger passwords that are harder to guess. And we are all, most definitely, computer literate, even our 80-year-old parents and our teenage sons and daughters. Yes sir. No weak link in this chain.
But really, what is the difference between &ldquo;appletree&rdquo; and &ldquo;poochie726&rdquo; (one&rsquo;s adorable poodle, plus said poodle&rsquo;s D.O.B)? Are you telling me that you have never had (or, dare I say...still have!) a password like this? I just don&rsquo;t believe you. Taking it a step further, if we generate a strong password, and come up with this: &ldquo;F_(sLOI:%QI^C]{4&rdquo; What is the point of using &ldquo;F_(sLOI:%QI^C]{4&rdquo; to protect your login, if I know that you are using &ldquo;F_(sLOI:%QI^C]{4&rdquo; to protect your login?
It is only strong if it is unknown, and, not easy to guess by brute force. An apartment block would not use a single key to open every door in the building, so what makes you think that &ldquo;poochie726&rdquo;, nay &ldquo;p00ch!3726&rdquo; for argument's sake, is OK to use for 100 different accounts that span both your personal life and your work life?
<h2>What is Credential Stuffing and Why Should You Care?</h2>
Even when people understand that they need to use strong passwords, it doesn&rsquo;t change the fact that people are faced with the challenge of remembering passwords daily. It quite simply becomes impossible without a password manager, and so people choose to come up with one or two really good ones, and then they use these everywhere. This leaves them open to a type of cyberattack called Credential Stuffing.
Credential Stuffing is when a hacker has a list of known username/password combinations that they &ldquo;acquired&rdquo; (perhaps the result of a previous data breach), and that they then use to try to log in to many other, different website and services. Sometimes they get lucky, hit the jackpot, and find an appletree-kinda person.
It might be that you signed up to a very insecure website 10 years ago that you no longer use or care about, and that this website was part of a data breach (pause &ndash; please&nbsp;<a href="https://haveibeenpwned.com/" rel="follow noopener" target="_blank">go and check</a>, I&rsquo;ll wait). But if you are still using the same password as you did back then, then it means that a hacker could very easily gain access to other accounts and data that you rely on now.
You might think that this type of attack would never work. But it does, and it is happening a lot. It is a growing trend (with a 45% year-on-year increase), that relies on human nature&rsquo;s laziness and reliance on convenience.
<h2>Taking Control: Your Action Plan Against Credential Stuffing</h2>
What can we, <a href="https://teampassword.com/features" rel="follow noopener" target="_blank">TeamPassword</a>, do about credential stuffing attacks? For you? Pretty much nothing, unless you meet us in the middle. Look what happened to&nbsp;<a href="https://techcrunch.com/2023/01/15/norton-lifelock-password-manager-data/?guccounter=1" rel="follow noopener" target="_blank">Norton LifeLock</a> or <a href="https://teampassword.com/blog/what-happened-during-nintendos-data-breach-in-2021" rel="follow noopener" target="_blank">Nintendo</a>. Sure, we have security controls in place on our service to protect you from what happened with those other companies, but does each of the 100 services you use have the same controls in place? Does each of these 100 services you use give you the option of MFA? And did you enable that MFA on all 100 services?
The only solution to this problem is for you to take responsibility away from the services you use, and into your own hands. Let go of the apple tree and get into a new habit, that looks like this:
<ol>
<li>Use a <a href="https://app.teampassword.com/signup" rel="follow noopener" target="_blank">password manager</a>.</li>
<li><a href="https://teampassword.com/password-generator" rel="follow noopener" target="_blank">Generate a random, strong password</a> for every service you use.&nbsp;</li>
<li>Turn on <a href="https://teampassword.com/blog/2fa-vs-mfa" rel="follow noopener" target="_blank">MFA</a> for every service you use.</li>
<li><a href="https://teampassword.com/blog/how-to-disable-your-browsers-built-in-password-manager#howtodisableyourbrowsersbuiltinpasswordmanager" rel="follow noopener" target="_blank">Turn off convenience tools</a> such as the &ldquo;remember this password&rdquo; feature of browsers and the &ldquo;stay signed in for 6 years&rdquo; checkboxes (ok that one is a joke, but you get the point).</li>
<li>Spend several minutes at the start of each work day signing in securely to everything. Not a big deal. If you follow these steps, you and the company you work for will be safe against Credential Stuffing attacks, and the only stuffing that you will need to worry about will be the turkey on Christmas day.</li>
</ol>
<h2>Conclusion</h2>
Here's the thing about cybersecurity: those data breaches and cyberattacks you read about? So many of them are preventable. But it's not just about what you do. We need to be like a rising tide, lifting all boats, making sure everyone's wise to the threats.
Why? Because a hacker only needs one open door. You might be on top of all the safety measures, but what about your team? Your family? Are they all doing their part?&nbsp;
Oh, and that friend with the &ldquo;appletree&rdquo; password. I once asked him how he came up with it. He told me: &ldquo;Oh, I copied the idea from another friend, they had an apple tree outside their house and told me they used it as their password&rdquo;. True story.&nbsp;

Still using "appletree" or "poochie726" for passwords? Learn why even "strong" reused passwords make you vulnerable to credential stuffing and how to truly secure your accounts.

Still using "appletree" or "poochie726" for passwords? Learn why even "strong" reused passwords make you vulnerable to credential ...

From Appletree to Anarchy: How Credential Stuffing Exploits Poor Password Hygiene

How Credential Stuffing Exploits Poor Password Hygiene

On April 18, 2025, South Korea's largest mobile carrier, SK Telecom (SKT), faced a significant cybersecurity incident. The company's core network was compromised in an attack that targeted its Home Subscriber Server (HSS), a central component managing subscriber data.
SKT later confirmed that the incident involved a "<a href="https://www.reuters.com/sustainability/boards-policy-regulation/sk-telecom-shares-plunge-after-data-breach-due-cyberattack-2025-04-28/#:~:text=SEOUL%2C%20April%2028%20%28Reuters%29%20,month%20caused%20by%20a%20cyberattack" rel="follow noopener" target="_blank">large-scale leak of data due to malware</a>" detected on the day of the attack. The compromised information included sensitive Universal Subscriber Identity Module (USIM) data &ndash; the data associated with SIM cards used by mobile subscribers. While SKT stated that personal names and financial account details were not exposed, the USIM data itself is critical for network authentication and services.
The scale of the breach was considerable, impacting a vast number of SKT's subscribers, estimated to be around 25 million &ndash; essentially their entire user base. The incident was quickly recognized as a major event in the history of Korean telecommunications, prompting significant concern. Following the announcement, SKT's stock experienced a decline.
In response, SKT issued a public apology, accepting responsibility for potential impacts on customers. They initiated immediate measures, offering free SIM card replacements and launching enhanced protection services for all users to mitigate potential risks.
Technical analysis provided more insight into the nature of the attack. Investigators believe sophisticated malware was used to infiltrate SKT's internal network. Security reports indicate that a malicious program was identified within SKT's systems on the night of April 19, 2025, prompting its immediate removal and isolation of affected equipment.
<h2 data-end="1173" data-start="1151">Technical Details of the SK Telecom Breach</h2>
Forensic examination by government agencies identified the intrusive software as multiple variants of a Linux backdoor known as BPFDoor. This type of malware is noted for its ability to remain hidden and has been associated in previous incidents with advanced persistent threat (APT) groups, suggesting a highly capable attacker.
The precise entry point used by the attackers is still under investigation, with some security experts suggesting a vulnerability in VPN or remote-access equipment may have been exploited. A joint SKT and government investigation is ongoing to fully understand the breach.
While there has been no confirmation of the stolen data being used maliciously so far, SKT proactively strengthened its fraud detection systems and expanded SIM-swap protections to prevent unauthorized porting of mobile numbers.
The SK Telecom incident highlights the persistent challenges in securing critical network infrastructure and the potential impact of sophisticated cyberattacks on a large scale. It underscores the need for continuous vigilance and robust security measures in the telecommunications sector.
<h2 data-end="2379" data-start="2352">Potential Perpetrators</h2>
No group immediately stepped forward to claim responsibility for the sophisticated infiltration, leaving investigators to piece together clues in the digital dust. Cybersecurity analysts quickly noted hallmarks suggesting a highly skilled, potentially state-sponsored actor. The appearance of the BPFDoor backdoor, a tool previously linked to hacking groups aligned with Chinese interests, became a focal point of speculation. Adding to this, reports from a Taiwanese security firm highlighted a pattern of China-linked advanced persistent threats (APTs) exploiting vulnerabilities in VPN software globally, including within the telecommunications sector &ndash; a potential parallel that fueled the ongoing inquiry. While South Korean authorities have remained cautious in official attribution, a comment from a Deputy Chair at the Personal Information Protection Commission hinted at a belief that the leak originated directly from SKT's main servers, seemingly pushing back against any suggestion otherwise. The focus of the government's investigation remains on pinpointing whether the breach stemmed from an insider threat or sophisticated external actors, and critically, whether SKT's security measures on its vital HSS servers were adequately robust.
<img src="https://cdn.buttercms.com/CDwgwk03ShqllTFsOZpS" alt="undefined" width="844" height="633">
<h2 data-end="3425" data-start="3402">Who is SK Telecom?</h2>
To understand the magnitude of this event, one must recognize SK Telecom's place in the fabric of South Korea. As the flagship wireless carrier and a key entity within the powerful SK Group, SKT isn't merely a mobile provider; it's a cornerstone of the nation's digital infrastructure. Commanding roughly half of the domestic mobile market, with a subscriber base of 23 to 25 million in a country of 50 million, SKT holds immense influence. The company has long been at the forefront of mobile technology, pioneering advancements from 3G to 5G, and its service portfolio extends across broadband, IoT, and digital media. As a publicly traded company with significant revenue, its operational health is tied to the national economy.
More crucially, SKT serves as a critical national asset, providing the underlying network capacity for smaller carriers and acting as a fundamental platform for countless financial and identity verification services that everyday citizens rely upon. In essence, SKT is South Korea's incumbent telecom giant, a figure comparable in its national significance to major carriers in other large economies.
<h2 data-end="4376" data-start="4356">Customer Impact - How are SK Telecom subscribers affected?&nbsp;</h2>
For the millions of SKT subscribers, the confirmed details of the breach brought a mix of relief and anxiety. SKT maintained that core personal identifiers like names, addresses, or financial data were not exposed.
However, attackers did obtain USIM-related information, including phone numbers and critical International Mobile Subscriber Identity (IMSI) values. This combination, while not granting direct access to bank accounts, is sufficient in theory to clone SIM cards or intercept those <a href="https://teampassword.com/blog/2fa-vs-mfa" rel="follow noopener" target="_blank">crucial two-factor authentication codes</a> sent via SMS that many services use. Encouragingly, IMEI device identifiers were reportedly not compromised, and SKT's investigation has, as of now, found no concrete evidence of the stolen data being misused. Nevertheless, the inherent risk of <a href="https://teampassword.com/blog/what-is-sim-swapping" rel="follow noopener" target="_blank">SIM-swap fraud</a>, a tactic where criminals take control of a victim's phone number to access accounts, was enough to generate significant concern among the customer base.
SKT responded by offering free SIM card replacements to all affected subscribers. The uptake was swift; within days, hundreds of thousands had swapped their cards, and millions more booked appointments online. However, the sheer scale of the user base quickly exposed a practical challenge: inventory shortages. Reports indicated SKT had a limited stock of spare SIMs and faced a scramble to procure millions more to meet demand. This logistical hurdle, coupled with the underlying anxiety, contributed to customer churn.
Media outlets highlighted that tens of thousands of subscribers opted to cancel or port their service to rival carriers in the immediate aftermath, a notable surge compared to previous months. While SKT's network and services generally remained operational, the company took the step of suspending new customer sign-ups while it focused on managing the crisis and reinforcing security. The breach undeniably eroded customer trust, creating widespread unease even without direct compromise of financial data or passwords.
<h2 data-end="6927" data-start="6892">Public and Government Response</h2>
The fallout from the SKT breach quickly escalated to the highest levels of government and public discourse. South Korea's Ministry of Science and ICT formally ordered SKT to halt new customer acquisitions at its retail locations until sufficient SIM card stock and enhanced protections were in place. SKT's CEO publicly acknowledged the severity, labeling it "the worst hacking case in telecom history" for the company and pledging a full effort to restore confidence. During a parliamentary hearing, the CEO faced sharp questions, confirming the date of the attack's detection and admitting to delays in officially notifying relevant authorities. The Acting President personally mandated a government review of SKT's handling of the incident within hours of it becoming public.
Government agencies mobilized to contain the fallout and bolster defenses. The Personal Information Protection Commission launched an investigation specifically to assess whether SKT had maintained adequate security safeguards on its USIM servers. Financial regulators convened meetings with banks and card issuers, issuing warnings and guidance on monitoring for potential SIM-swap fraud. Law enforcement and the National Assembly also became involved, assisting SKT in developing its SIM Protection service and signaling a potential push for stronger cybersecurity legislation. Public advisories were issued, cautioning citizens about circulating <a href="https://teampassword.com/blog/spear-phishing" rel="follow noopener" target="_blank">phishing scams</a> leveraging the incident, and SKT itself clarified how it would communicate official information to customers.
The incident garnered relentless media attention, both domestically and internationally, keeping the breach's scope and the need for preventative measures in the public eye. Social media became a hotbed of rumors, prompting SKT to publicly debunk false claims about stolen data being sold online. Beyond immediate technical responses, customer advocacy groups and lawmakers began exploring broader protections, including proposals to waive contract penalties for customers wishing to switch providers due to the breach. Meanwhile, some SKT subscribers took legal action, filing class-action lawsuits seeking compensation for the distress and inconvenience caused by the security failure.
<h2>Actions Steps to Protect Yourself from the Breach</h2>
Responding to a cybersecurity incident requires decisive action. For individuals affected by the SK Telecom data breach, experts and authorities advise implementing the following protective measures:
1. Secure Your SIM Card: The primary recommendation is to obtain a new SIM card. SK Telecom is providing free replacements for all affected subscribers. This can typically be arranged by making an appointment or visiting an SKT retail store or authorized kiosk. Replacing the physical SIM card invalidates the compromised authentication keys that were potentially exposed during the breach, thereby mitigating a key risk factor.
2. Activate SIM Protection Services: Regardless of whether you replace your physical SIM, it is strongly advised that all SKT customers enroll in the company's USIM Protection Service. This service functions by electronically binding your phone number to your current SIM card, creating a safeguard against unauthorized SIM porting or swapping attempts. Official statements indicate that this service offers a level of defense against illicit activity comparable to that of physically replacing the SIM. Enrollment is generally accessible through SKT's online platforms or their official mobile application.
3. Exercise Caution Regarding Unsolicited Communications: Be highly suspicious of unexpected text messages or emails that reference the SKT SIM replacement process or related security measures. SKT has issued warnings that fraudulent "smishing" (SMS phishing) and phishing attempts are likely circulating, attempting to exploit the situation. Legitimate notifications and instructions from SKT concerning this breach will be communicated through official, verified channels, such as messages originating from the designated service number (e.g., 114) or within the secure environment of the official SKT mobile application. Avoid clicking on links or sharing personal or SIM-related information in response to any unsolicited messages.
4. Reinforce Account Security: As a precautionary step, it is prudent to re-authenticate your login sessions for critical mobile applications, including banking, email, and any digital identity or authentication apps (such as the PASS app). Monitor your financial accounts diligently for any unusual or unexpected activity. Review and update <a href="https://teampassword.com/blog/ultimate-guide-to-password-security-teampassword" rel="follow noopener" target="_blank">passwords</a> for important online accounts. Where available, enable multi-factor authentication (MFA), prioritizing methods that do not rely on SMS delivery, such as <a href="https://teampassword.com/blog/best-authenticator-apps" rel="follow noopener" target="_blank">dedicated authenticator applications</a>, as SMS-based codes can potentially be intercepted in SIM-swap scenarios.
5. Consult Official Information Sources: Stay informed about the incident and ongoing protective measures by referring exclusively to official announcements from SK Telecom, available on their verified website and social media platforms, as well as reports from credible news organizations. Authorities may also establish dedicated hotlines or online resources to provide specific guidance and allow individuals to check if their account was directly affected. SKT and relevant government ministries are maintaining support channels and frequently asked questions sections to assist subscribers through the SIM replacement and protection enrollment processes.
Implementing these recommended actions will substantially reduce the risk of potential fraud or unauthorized access stemming from the breach. While the compromised data alone is not sufficient for immediate financial account depletion, replacing the SIM and enabling protective services significantly complicates attempts at unauthorized SIM-swap attacks. Maintaining vigilance against related social engineering tactics, such as criminals impersonating legitimate entities, remains essential.
<a href="https://koreajoongangdaily.joins.com/news/2025-05-02/business/industry/Text-messages-about-SIM-card-replacements-could-be-phishing-scams-SK-Telecom-warns/2299020" rel="follow noopener" target="_blank">SKT has emphasized that all authentic communications regarding SIM replacement during this period will originate solely from their official channels.</a>

SK Telecom hit by major cyberattack in April 2025, compromising USIM data for 25 million subscribers. Learn about the breach, its scale, and the potential impact on mobile users in South Korea.

SK Telecom hit by major cyberattack in April 2025, compromising USIM data for 25 million subscribers. Learn about ...

2025 SK Telecom Breach

One-time passwords (OTP) are a critical component of multi-factor authentication (MFA). Here’s how TOTP, HOTP, and OTP work.

TOTP vs. OTP vs. HOTP: What are they and which is most secure?

Find the best password management for your IT or MSP business. In-depth comparison of TeamPassword, Keeper Security, Bitwarden, Dashlane, & more for features, security, & pricing.

Find the best password management for your IT or MSP business. In-depth comparison of TeamPassword, Keeper Security, Bitwarden, ...

The Best Password Management Software for IT and MSPs

A built-in password manager, the type that comes with your internet browser, is like a piece of buttery toast in the morning &mdash; quick, convenient, but not the most exciting option ever.
Sure, browser password managers beef up your internet security, but they are just OK. Not bad, not good, just somewhere in-between. You're about to learn why. Plus, discover how to disable your browser's current built-in password manager.
TeamPassword is the No.1 password manager for teams that lets you share logins across browsers and devices. Take advantage of the <a href="https://app.teampassword.com/signup" rel="follow noopener" target="_blank">TeamPassword free trial</a>.
<h2>Why Are In-Built Password Managers Just OK?</h2>
Let's take Google Password Manager, Chrome's de facto password protector. It does what it says it does:&nbsp;Manages saved passwords in Chrome and Android. But what happens to passwords if you switch to Firefox? Or Microsoft Edge?&nbsp;
And what happens to passwords saved in Firefox Password Manager when you switch to Chrome or Edge? Or passwords in Microsoft Edge Password Manager when you use Firefox or Chrome?
It's messy.
The problem is, a lot of us use&nbsp;<a href="https://www.statista.com/statistics/268299/most-popular-internet-browsers/" target="_blank" rel="noopener">more than one browser</a>&nbsp;&mdash; Chrome on a laptop and Safari on an iPhone, or Edge on a desktop and Chrome on an Android.&nbsp;
In-built password managers&nbsp;can't pull passwords from browser-to-browser&nbsp;or passwords from&nbsp;device-to-device. This means fewer protections and more forgotten passwords. (Seventy-eight percent of us <a href="https://www.digitalinformationworld.com/2019/12/new-password-study-finds-78-of-people-had-to-reset-a-password-they-forgot-in-past-90-days.html#:~:text=Study%3A%2078%20Percent%20People%20Forget,For%20Reset!%20%2F%20Digital%20Information%20World" target="_blank" rel="noopener">can't remember passwords</a>.)&nbsp;
<h2 id="whyarethirdpartypasswordmanagersbetterforteams">Why Are Third-Party Password Managers Better For Teams?</h2>
In-built password managers aren't popular among large teams that collaborate on projects. In a survey, employees in the technical sector used in-built password managers for&nbsp;<a href="https://www.andrew.cmu.edu/user/nicolasc/publications/Pearman-SOUPS19.pdf" target="_blank" rel="noopener">15-50 login credentials</a>&nbsp;and third-party password managers for over 100 password-protected accounts. Employees contained more passwords in third-party managers.&nbsp;
But why? 
Firstly, there isn't a convenient or secure way to share passwords saved to your personal (or work) Google account. You have to enter your Chrome password manager, find the login, then copy the username and password to send to your colleague...probably through an unsafe medium like text or email. Secondly, browser password managers autosave basic login information but lack a good way to save other types of secrets or notes. Even if they did, they would be a pain to share.
There's a perception that in-built password managers are a better fit for personal passwords &mdash; logins for banking, email, and streaming accounts. Most teams use third-party password managers for shared files, folders, and other projects.
<h2 id="whatarethebenefitsofthirdpartypasswordmanagersliketeampassword">What Are the Benefits of Third-Party Password Managers Like TeamPassword?</h2>
Third-party managers serve different purposes than in-built managers. They boast features such as
<ul>
<li>Automatic password syncing across all browsers and devices</li>
<li>Password encryption</li>
<li><a href="https://teampassword.com/blog/one-time-passwords-vs-two-factor-authentication" target="_blank" rel="noopener">Two-factor authentication</a></li>
<li>Password activity</li>
<li>Password logging</li>
<li>Unique password generation (try this <a href="https://teampassword.com/password-generator" rel="follow noopener" target="_blank">free password generator</a>)</li>
</ul>
<img src="https://cdn.buttercms.com/P5yfiF8zQVKmcppW4Hoo" alt="TeamPassword Password Generator.webp" width="812" height="329">
TeamPassword goes one step further with enhanced password management for teams that need to access shared login details and keep collaborative projects moving. <a href="https://teampassword.com/security" target="_blank" rel="follow noopener">Discover more here</a>!
Using a third-party password manager provides a bundle of benefits. But you'll probably need to disable your browser's&nbsp;current password manager before using one.
<h2 id="howtodisableyourbrowsersbuiltinpasswordmanager">How to Disable Your Browser's Built-In Password Manager</h2>
We've written in-depth articles with steps and screenshots for the four major browsers:
<ul>
<li><a href="https://teampassword.com/blog/how-to-disable-google-chrome-password-manager" rel="follow noopener" target="_blank">How to Disable Google Chrome Password Manager</a></li>
<li><a href="https://teampassword.com/blog/how-to-disable-firefox-password-manager" rel="follow noopener" target="_blank">How to Disable Firefox Password Manager</a></li>
<li><a href="https://teampassword.com/blog/how-to-disable-microsoft-edge-password-manager" rel="follow noopener" target="_blank">How to Disable Microsoft Edge Password Manager</a></li>
<li><a href="https://teampassword.com/blog/how-to-disable-safari-password-manager" rel="follow noopener" target="_blank">How to Disable Safari Password Manager</a></li>
</ul>
Here are the cliff notes:
Chrome:
<ol>
<li>Click your&nbsp;profile icon&nbsp;in the top right corner of your browser window.&nbsp;</li>
<li>Click the&nbsp;key symbol&nbsp;to open Google Password Manager.</li>
<li>Select&nbsp;Settings, then toggle&nbsp;Offer to save passwords&nbsp;off.&nbsp;</li>
</ol>
Firefox:
<ol>
<li>Click the Hamburger Menu button in the top right of your browser and click&nbsp;Settings</li>
<li>Click&nbsp;Privacy and Security&nbsp;on the left</li>
<li>Scroll down to the&nbsp;Logins and Passwords&nbsp;section</li>
<li>Uncheck&nbsp;Ask to save logins and passwords for websites.&nbsp;</li>
</ol>
Edge:
<ol>
<li>Click the three dot menu in the top right and click&nbsp;Settings.&nbsp;</li>
<li>Under the Profiles section, click&nbsp;Passwords.</li>
<li>From the menu on the left, select&nbsp;Settings&nbsp;(this takes you to autofill and password settings)</li>
<li>Scroll down and toggle off&nbsp;Offer to save passwords. You can do the same for&nbsp;Payment methods&nbsp;and&nbsp;Personal info.</li>
</ol>
Safari
<ol>
<li>Click the&nbsp;Safari menu&nbsp;at the top bar.</li>
<li>Click&nbsp;Settings.</li>
<li>Click the&nbsp;Passwords&nbsp;and unlock your device when prompted.</li>
<li>Click&nbsp;Password Options.</li>
<li>Turn off AutoFill&nbsp;completely, or just&nbsp;disable iCloud Keychain</li>
</ol>
<h2>Now that you've disabled your browser password manager...</h2>
Stepping up to a dedicated password manager provides essential layers of security and functionality:
<ul data-sourcepos="13:1-20:0">
<li data-sourcepos="13:1-13:378">Advanced Encryption: Your passwords aren't just stored; they are secured with state-of-the-art encryption protocols, often utilizing a "zero-knowledge" architecture. This means your sensitive information is encrypted on your device before it ever leaves it, and only you hold the key to decrypt it. Even the password manager provider cannot access your unencrypted data.</li>
<li data-sourcepos="14:1-14:335">Robust Two-Factor Authentication (2FA) Options: Go beyond basic password protection. Dedicated managers offer more sophisticated 2FA methods, adding an extra layer of verification to access your password vault, making it significantly harder for unauthorized individuals to gain entry even if your master password is compromised.</li>
<li data-sourcepos="15:1-15:225">Comprehensive Password Activity and Logging: Gain visibility into when and where your passwords are being accessed. Detailed activity logs provide an audit trail, crucial for identifying any suspicious activity quickly.</li>
<li data-sourcepos="16:1-16:306">Seamless and Secure Automatic Syncing: Access your protected passwords across all your devices and operating systems effortlessly and securely. Dedicated managers ensure your vault is always up-to-date, whether you're on your desktop, laptop, or mobile device, without being tied to a single browser.</li>
<li data-sourcepos="17:1-17:351">Intelligent and Unique Password Generation: Eliminate the temptation to reuse passwords or create weak, memorable ones. Dedicated managers generate strong, complex, and unique passwords for every single online account, drastically reducing the risk of credential stuffing attacks where a breached password from one site is used to access others.</li>
<li data-sourcepos="18:1-18:311">Secure Sharing Capabilities: For businesses and even families, securely sharing login credentials is often necessary. Dedicated password managers provide encrypted methods to share specific passwords with trusted individuals or teams without exposing the password itself, maintaining control and security.</li>
<li data-sourcepos="19:1-20:0">Password Health and Monitoring: Many dedicated solutions include features to audit your existing passwords for weakness, age, or potential compromise in data breaches (including dark web monitoring), proactively alerting you to take action.</li>
</ul>
For businesses of all sizes, from small startups to large enterprises, a dedicated password manager is an investment in your cybersecurity posture and operational efficiency. Secure sharing and centralized management features simplify onboarding and offboarding employees, streamline access to shared accounts and data-driven projects, and help enforce strong password policies across the organization. In an era where remote work is prevalent, ensuring secure access for a distributed workforce is paramount, and dedicated password managers provide the framework to achieve this.
<iframe width="560" height="314" src="https://www.youtube.com/embed/MAR1KYEsB_s" allowfullscreen="allowfullscreen"></iframe>
Are you looking for a safe alternative to your built-in password manager? We designed TeamPassword for teams with collaboration in mind. <a href="https://app.teampassword.com/signup" rel="follow noopener" target="_blank">Start your free&nbsp;</a><a href="https://app.teampassword.com/signup" rel="follow noopener" target="_blank">14-day trial&nbsp;now</a>.

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In this digital age, our lives are pretty much lived online - from banking to socializing, we rely heavily on our accounts and passwords to keep our sensitive information safe.&nbsp;
But let's face it, passwords alone are not enough to keep the bad guys out. That's where 2FA comes in &mdash; an extra layer of security that can make all the difference between a secure account and a breached one.
Most of us have heard of 2FA, but not everyone knows how to use it properly. When used correctly, 2FA <a href="https://teampassword.com/blog/your-passwords-arent-safe-unless-youre-taking-these-5-steps" rel="follow noopener" target="_blank">provides an additional layer of security</a> that can significantly reduce the risk of unauthorized access to your accounts.&nbsp;
In this article, we'll discuss why 2FA is so important and share the best practices for using it.
The four key tips to maximize security with two-factor authentication are:
<ul>
<li>Use 2FA on all of your accounts.</li>
<li>Choose the type of 2FA that's right for you.</li>
<li>Store 2FA backup codes in a secure location.</li>
<li>Use 2FA with a password manager.</li>
</ul>
&nbsp;So sit back, grab a cup of coffee, and let's dive into the world of online security and explore how 2FA and password managers can help keep your accounts safe and sound.
<h2 id="Why 2FA is Important">Why Is Two-Factor Authentication (2FA) Important?</h2>
The risk of unauthorized access and data breaches is higher than ever. By using 2FA, you can add an extra layer of security to your accounts, making it much more difficult for cybercriminals to gain access to your sensitive information.&nbsp;
2FA makes it harder for hackers to access your accounts because even if they manage to steal your password, they still need a second factor to gain access. It could be a fingerprint, a code sent to your phone or a hardware token.&nbsp;
By implementing 2FA, you can significantly <a href="https://www.imperva.com/learn/application-security/2fa-two-factor-authentication/" rel="nofollow noopener" target="_blank">reduce the risk</a> of unauthorized access and protect your personal and sensitive data from being compromised. This is a great way to protect yourself and your business against cybercrime and online fraud.&nbsp;
<h2 id="How to Use 2FA">How To Use Two-Factor Authentication</h2>
<h3>Use 2FA on All Accounts</h3>
To maximize security, it&rsquo;s vital for individuals and businesses alike to use 2FA on all accounts, including social media, email, banking, and other online services.&nbsp;
This is even more important today when almost all critical business and financial data online is being stored and accessed online. For instance, one recent survey of small business owners found that <a href="https://www.creditdonkey.com/best-bank-small-business.html" rel="nofollow noopener" target="_blank">over 40% of respondents</a> are now using online banking exclusively for their financial needs. The good news is that most online financial and banking services offer 2FA measures.
To enable multi-factor authentication on your accounts, go to your account settings and look for the option to enable 2FA for MFA (multi-factor authentication). Most services will guide you through the process, which typically involves linking your account to a second factor, such as your phone or fingerprint.
<img src="https://cdn.buttercms.com/s8GGB3tFR3dkPR1ld1CA" alt="undefined" width="860" height="587">
<h3>Choose the Right Type of 2FA</h3>
When setting up 2FA, choosing the right type that suits your needs is essential. The most common types of 2FA are SMS codes, email-based 2FA, <a href="https://teampassword.com/blog/best-authenticator-apps" rel="follow noopener" target="_blank">app-based authentication</a>, and hardware keys.&nbsp;
SMS codes are the simplest to set up but can be vulnerable to <a href="https://teampassword.com/blog/what-is-sim-swapping" rel="follow noopener" target="_blank">SIM-swapping attacks</a>, where hackers can take control of your phone number and intercept your 2FA codes.
Email-based 2FA sends a verification code to your email address. It&rsquo;s easy to set up and receive messages, however, like SMS it too can be vulnerable to attack, but is safer than SMS.&nbsp;
App-based authentication, such as Google Authenticator or <a href="https://ente.io/auth/" rel="follow noopener" target="_blank">Ente Auth</a>, is more secure and reliable than either SMS or email-based 2FA. It relies on the use of an authentication app like Google Authenticator or Microsoft Authenticator to generate time-based codes. The app syncs with the online account you&rsquo;ve secured with 2FA. These options are more secure because they're not tied to your phone number and require physical possession of the linked device.&nbsp;
Hardware keys are the most secure but also the most expensive and may be less convenient. Hardware keys are small physical keys that users plug into their computer in order to access the accounts that are linked to the key.&nbsp;
There&rsquo;s also <a href="https://teampassword.com/blog/types-of-biometrics" rel="follow noopener" target="_blank">biometric 2FA</a>, a relatively new form of two-factor authentication that verifies a user's access level using a unique identifier, such as a fingerprint, voice, or iris structure. It is generally more reliable and harder to compromise than other types of 2FA, but it's also much more expensive to implement.&nbsp;
<h3>Store Backup Codes in a Secure Location</h3>
When setting up 2FA, most services provide you with backup codes that you can use to log in to your account if you lose access to your primary authentication method.&nbsp;
It's essential to store these backup codes <a href="https://teampassword.com/blog/password-manager-with-2fa" rel="follow noopener" target="_blank">in a secure location</a>, such as a password manager or a physical safe. Be sure to keep them separate from your primary authentication method to avoid losing both at the same time.
<img src="https://cdn.buttercms.com/txwhKLaLSxiyaNyFh2PG" alt="undefined" width="825" height="433" style="display: block; margin-left: auto; margin-right: auto;">
<h2 id="2FA and Password Manager">Use 2FA and a Password Manager for Ultimate Security</h2>
In addition to using two-factor authentication, password managers are another essential tool for securing your online accounts.&nbsp;
Reliable password managers like <a href="https://teampassword.com" rel="follow noopener" target="_blank">TeamPassword</a> allow you to create and store strong, unique passwords for each of your accounts. This helps reduce the risk of a hacker accessing multiple accounts if one password is compromised. Password managers use military-level encryption technology and comply with all regulations, including the Payment Card Industry Data Security Standard (also known as PCI DSS), which <a href="https://www.atlantic.net/pci-compliant-hosting/what-is-pci-compliance/" rel="follow noopener" target="_blank">are a set of requirements</a> designed to ensure online merchant transactions are kept encrypted and protected.&nbsp;
Here are some more benefits of using a password manager:
<ul>
<li>
Generate strong, unique passwords: Password managers can create and store passwords that are more complex and harder to guess than anything you would come up with on your own. Try it out with this free password generator: <a href="https://teampassword.com/password-generator">https://teampassword.com/password-generator</a>
</li>
<li>
Autofill login information: Instead of typing in your username and password every time you visit a website, a password manager can automatically fill in your login information.
</li>
<li>
Encrypted storage: Password managers <a href="https://www.howtogeek.com/141500/why-you-should-use-a-password-manager-and-how-to-get-started/" rel="follow noopener" target="_blank">store your passwords</a> in an encrypted format, meaning that even if a hacker gains access to your password manager, they won't be able to read your passwords.
</li>
</ul>
<ul>
<li>
Audit trail: They keep a record of all password-related activities, providing full visibility and accountability to team administrators.
</li>
</ul>
<ul>
<li>
Convenient access: Password managers can be accessed from multiple devices, so you can easily log in to your accounts from your phone, tablet, or computer.
</li>
</ul>
<h2 id="Security Best Practices">Other Security Best Practices To Follow</h2>
<ul>
<li>
Update your phone and apps regularly: Keeping your phone and 2FA apps up to date is essential to ensuring your accounts are secure. Updates often include security patches that address known vulnerabilities.
</li>
<li>
Monitor your accounts regularly: Even with 2FA enabled, it's important to monitor your accounts regularly for any suspicious activity. If you notice anything unusual, change your passwords immediately and contact the service provider.
</li>
<li>
Keep your second factor secure: Treat your second factor (e.g., your phone or hardware key) with the same level of security as your password. Keep it in a secure location, and don't share it with others.
</li>
<li>
Revoke access to old devices and accounts: If you replace or dispose of a device or account that has 2FA enabled, make sure to <a href="https://teampassword.com/blog/how-to-protect-company-information-when-an-employee-leaves" rel="follow noopener" target="_blank">revoke its access</a> to your accounts. This prevents someone else from accessing your accounts using the old device.
</li>
</ul>
<h2>Secure Your Digital Life Today with a Password Manager</h2>
With the increasing prevalence of online security breaches and cyberattacks, taking proactive measures to protect your personal information is more important than ever.&nbsp;
Securing your online accounts is critical to protecting your digital life. Two-factor authentication (2FA) and <a href="https://app.teampassword.com/signup" rel="follow noopener" target="_blank">password managers like TeamPassword</a> are powerful tools that can help you achieve this goal.&nbsp;
TeamPassword supports Enforceable 2FA, meaning the admin can require anyone who joins their password vault to set up 2FA via a software token (authenticator app).&nbsp;
By following the best practices outlined in this article and using these tools to their fullest potential, you can significantly enhance the security of your online accounts and ensure that your sensitive information remains private. Implement these security measures to stay ahead of potential threats in the ever-evolving digital landscape.

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