X.500 Standard status
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Public-Key Infrastructure (X.509) (pkix))

The Public-Key Infrastructure (X.509) (PKIX) was a working group under the Internet Engineering Task Force (IETF).

PKIX) developed a large number of Internet specifications to support X.509-based Public Key Infrastructures. PKIX has terminated its activity, but maintains an e-mail exploder.

While the CA/Browser Forum and ETSI ESI are primarily profiling the ITU-T X.509 for special purposes, the PKIX was in addition a standard making body having produced a large number of PKIX specifications.

PKIX has developed an important specification called Online Certificate Status Protocol (OCSP).

PKIX has also developed some X.509 Extensions beyond those defined by X.509 itself.

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