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message authentication code (MAC)

Definition(s):

  A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data. See checksum.
Source(s):
CNSSI 4009-2015

  Message Authentication Code.
Source(s):
NIST SP 800-185 under MAC

  A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of data.
Source(s):
NIST SP 800-152 under Message Authentication Code (MAC)

  A bit string of fixed length, computed by a MAC generation algorithm, that is used to establish the authenticity and, hence, the integrity of a message.
Source(s):
NIST SP 800-38B under Message Authentication Code (MAC)

  A cryptographic checksum on data that is designed to reveal both accidental errors and intentional modifications of the data.
Source(s):
NIST SP 800-38C under Message Authentication Code (MAC)

  A cryptographic checksum on data that uses an approved security function and a symmetric key to detect both accidental and intentional modifications of data.
Source(s):
NIST SP 800-133 Rev. 2 under Message Authenciation Code (MAC)
NIST SP 800-175B Rev. 1 under Message Authentication Code (MAC)
NIST SP 800-57 Part 1 Rev. 5 under Message authentication code (MAC)

  A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data. MACs provide authenticity and integrity protection, but not non-repudiation protection.
Source(s):
NIST SP 800-63-3 under Message Authentication Code (MAC)

  A cryptographic checksum based on an approved cryptographic function and a symmetric key to detect both accidental and intentional modifications of data.
Source(s):
NIST SP 800-57 Part 2 Rev.1 under Message authentication code

  A family of secret-key cryptographic algorithms acting on input data of arbitrary length to produce an output value of a specified length (called the MAC of the input data). The MAC can be employed to provide an authentication of the origin of data and/or data-integrity protection. In this Recommendation, approved MAC algorithms are used to determine families of pseudorandom functions (indexed by the choice of key) that are employed during key derivation.
Source(s):
NIST SP 800-108r1 under message authentication code

  A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data.
Source(s):
NISTIR 7711 under Message Authentication Code