Keyed hashing method for message authentication. HMAC is used with an iterative cryptographic hash function, such as MD5 or SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function.
Hash Message Authentication Code. A mechanism for ensuring the data integrity of online communications that uses cryptographic message digest functions to provide online integrity checking of data that is transmitted. HMAC can be used with any iterative cryptographic message digest function, for example, MD5, SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying message digest function. HMAC is also called Hash-based Message Authentication Code algorithm. See also message digest; message digest function.
Hashed Message Authentication Code. (Hashed MAC.) A standardized approach to using hash algorithms to create message authentication codes. HMAC is generally a pair of nested digests: the first is a digest the key and the data; the second is a digest of the key and the output of the first digest.
Hashed Message Authentication Code. A mechanism for message authentication that uses cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function - for example, MD5 or SHA-1 - in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function. Defined in RFC 2104, HMAC: Keyed-Hashing for Message Authentication.
Hashed Message Authentication Code. A message authentication algorithm, based on either SHA-1 or MD5.
(Hashed Message Authentication Code) A mechanism for message authentication, using cryptographic one-way hash functions, based upon RFC 2104 and commonly used in VPNs. The end result is that when you receive a data packet, you can know that whoever sent the packet possesses the same secret key that you do. You can combine this with other technologies, such as IKE, to know who sent a given message.
A keyed-hash message authentication code, or HMAC, is a type of message authentication code (MAC) calculated using a cryptographic hash function in combination with a secret key. As with any MAC, it may be used to simultaneously verify both the data integrity and the authenticity of a message. Any iterative cryptographic hash function, such as MD5 or SHA-1, may be used in the calculation of an HMAC; the resulting MAC algorithm is termed HMAC-MD5 or HMAC-SHA-1 accordingly.