X.509
What is a certificate? A certificate is merely a data structure that binds a public key to subjects (unique names, DNS entries, or e-mails) and is used to authenticate that a public key indeed belongs to the subject. In the late 1980s, the X.500 OSI Directory Standard was defined by the International Organization for Standardization (ISO) and the International Telecommunication Union (ITU). It was developed for implementing a network directory system, and part of this directory standard was the concept of authentication of entities within the directory. X.509 is the portion of the X.500 standard that addresses the structure of certificates used for authentication.
Several versions of the X.509 certificates have been created, with version ...
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