X.509 certificates are digital certificates used to verify the identity of websites, individuals, and other entities over networks. They are a core component of Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols, which enable secure communication over the internet. X.509 certificates contain information such as the subject's name, the issuer's name, the subject's public key, and the certificate's validity period. They are commonly used to encrypt communications, authenticate users, and secure software distribution through digital signatures.
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