X.509 public key certificate

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Definitions:

A digital certificate containing a public key for an entity and a unique name for that entity together with some other information that is rendered un-forgeable by the digital signature of the certification authority that issued the certificate, which is encoded in the format defined in the ISO/ITU-T X.509 standard.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under X.509 public-key certificate

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