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Networking and Infrastructure

Digital Certificate

An electronic document that uses a digital signature to bind a public key with an identity, enabling encrypted communication and identity verification.

A digital certificate is an electronic credential issued by a Certificate Authority (CA) that binds an entity’s identity to a public cryptographic key. Certificates are used in TLS/SSL to establish encrypted HTTPS connections, in code signing to verify software authenticity, and in email encryption (S/MIME).

The certificate contains the entity’s name, public key, issuing CA, validity period, and the CA’s digital signature. Browsers and operating systems maintain lists of trusted CAs and validate certificates against them.

For teams, managing digital certificates for internal services, APIs, and domains is essential. Expired or misconfigured certificates can break encrypted connections and expose credentials in transit. Certificate management should be part of the team’s security operations.

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