What are X509 certificates and how do they enable trust

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The X.509 certificate protocol is introduced as the certificate is the digital proof, signed by a trusted certificate authority (CA), that the user’s identity is valid. Technically it is possible for a user to self-sign their certificate rather than being issued it by a CA. However, most browsers and networks have deprecated the use of self-signed certificates due to their potential to be fraudulent.

The various security features that are part of the X.509 certificate standard make it easy for all parties to quickly ascertain the trustworthiness and unique identifiers of another party. However, the responsibility for maintaining this trust lies with CAs, who must monitor all issued certificates and uphold the protocols standards.

 

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