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SynAc
Acronym

CMAC

A message authentication code [SP38B] that is based on a symmetric block cipher. (See: block cipher.)

Senses

(N)

A message authentication code [SP38B] that is based on a symmetric block cipher. (See: block cipher.)

Derivation: Cipher-based MAC. (Compare: HMAC.)

Tutorial: Because CMAC is based on approved, symmetric-key block ciphers, such as AES, CMAC can be considered a mode of operation for those block ciphers. (See: mode of operation.)

References
  • IETF RFC 4949 (Internet Security Glossary)Jan 06, 2026
    RFC 4949 — Internet Security Glossary (Version 2)
    https://www.rfc-editor.org/rfc/rfc4949.txt
    RFC 4949 is published by the IETF Trust and marked as "Distribution of this memo is unlimited". Verify IETF Trust copyright/licensing terms for reuse.
    Source: IETF RFC 4949 (rfc-editor.org).