The architecture, organization, techniques, practices, and procedures that collectively support the implementation and operation of a certificate-based public key cryptographic system. Framework established to issue, maintain, and revoke public key certificates.
Source(s):
NIST SP 800-53 Rev. 5 under public key infrastructure from CNSSI 4009-2015

  A support service to the PIV system that provides the cryptographic keys needed to perform digital signature-based identity verification and to protect communications and storage of enterprise data.
Source(s):
NIST SP 1800-12b under public key infrastructure

  A set of policies, processes, server platforms, software and workstations used for the purpose of administering certificates and public-private key pairs, including the ability to issue, maintain, and revoke public key certificates.
Source(s):
NISTIR 7711 under Public Key Infrastructure

  The framework and services that provide for the generation, production, distribution, control, accounting, and destruction of public key certificates. Components include the personnel, policies, processes, server platforms, software, and workstations used for the purpose of administering certificates and public-private key pairs, including the ability to issue, maintain, recover, and revoke public key certificates.
Source(s):
NIST SP 800-53 Rev. 4 [Superseded] under Public Key Infrastructure from CNSSI 4009