长沙县4月24日起调整教练车禁训区域和路段范围

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Hash-based message authentication code(HMAC) is a mechanism used for cryptographically authenticating messages.

It can use any kind of cryptographic hash function. Its strength depends on the underlying hash function and the chosen secret key. With such a combination, the HMAC verification algorithm is then known with a compound name such as HMAC-SHA2.

HMAC is used to ensure both integrity and authentication.

See also