An entity that relies on the validity of the binding of the Subscriber’s name to a public key to verify or establish the identity and status of an individual, role, or system or device; the integrity of a digitally signed message; the identity of the creator of a message; or confidential communications with the Subscriber.
Source(s):
CNSSI 4009-2015 from CNSSI 1300

  An entity that relies upon the subscriber’s authenticator(s) and credentials or a verifier’s assertion of a claimant’s identity, typically to process a transaction or grant access to information or a system.
Source(s):
NIST SP 1800-17b under Relying Party
NIST SP 1800-17c under Relying Party
NIST SP 800-63-3 under Relying Party (RP)
NISTIR 8149 under Relying Party (RP) from NIST SP 800-63-3

  A party that depends on the validity of the digital signature process.
Source(s):
NIST SP 800-102 under Relying party
NIST SP 800-89 under Relying party

  In this Recommendation, a party that relies on the security and authenticity of a key or key pair for applying cryptographic protection and removing or verifying the protection that has been applied. This includes parties relying on the public key in a public key certificate and parties that share a symmetric key.
Source(s):
NIST SP 800-152 under Relying party

  An entity that relies upon the subscriber’s credentials, typically to process a transaction or grant access to information or a system.
Source(s):
NIST SP 800-73-4 under Relying Party

  An entity that relies on the certificate and the CA that issued the certificate to verify the identity of the certificate's subject and/or owner; the validity of the public key, associated algorithms and any relevant parameters; and the subject’s possession of the corresponding private key.
Source(s):
NIST SP 800-57 Part 2 Rev.1 under Relying party

  An entity that relies on the certificate and the CA that issued the certificate to verify the identity of the certificate owner and the validity of the public key, associated algorithms, and any relevant parameters in the certificate, as well as the owner’s possession of the corresponding private key.
Source(s):
NIST SP 800-175B Rev. 1 under Relying party

  A party that relies on the security and authenticity of a key or key pair for applying cryptographic protection and/or removing or verifying the protection that has been applied. This includes parties relying on the public key in a public key certificate and parties that share a symmetric key.
Source(s):
NIST SP 800-57 Part 1 Rev. 5 under Relying party

  A person or Agency who has received information that includes a certificate and a digital signature verifiable with reference to a public key listed in the certificate, and is in a position to rely on them.
Source(s):
NIST SP 800-32 [Withdrawn] under Relying Party

  An entity that relies on received information for authentication purposes.
Source(s):
NIST SP 800-57 Part 2 [Superseded] under Relying party

  An entity that relies upon the Subscriber's token and credentials or a Verifier's assertion of a Claimant’s identity, typically to process a transaction or grant access to information or a system.
Source(s):
NIST SP 800-63-2 [Superseded] under Relying Party (RP)