HMAC

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HMAC

HMAC

(Hash-based Message Authentication Code) A fixed-length value computed from a variable amount of text for authentication purposes. The hashing algorithm uses a secret key to create the hash code, which is sent along with the message. At the receiving end, the same secret key is used to generate the code, which is compared with the sender's hash code to verify the integrity of the message. See MAC, hash function and digital signature.
References in periodicals archive ?
Common authentication algorithms have been used in ESP and AH that includes HMAC-MD5, HMAC- Secure Hash Algorithm 1(SHA1), HMAC-MD5-96, and HMAC-SHA1-96 with 10[micro]s cryptographic processing delay.
The basic idea of our scheme is that sensor nodes encode the ordering and adjacent relationships among their collected data items through a hashed message authentication coding function (HMAC-MD5 [23], HMAC-SHA1 [24], et al.), thus any abnormal query reply resulting from a compromised storage node injecting fake data into or discarding qualified data will be easily verified.
E.g., a HMAC may have 128 bits with HMAC-MD5 [23] or 160 bits with HMAC-SHA1 [24].
Suppose that the 128 bits HMAC-MD5 is used ([alpha]=128), the results of impact of [beta] on Pr are shown in Fig.
We use HMAC-MD5 as the HMAC algorithm, which generates 128 bits output.
Because the hashing algorithm MD5 is much more costly than XOR and concatenating operations, the cost of HMAC-MD5 can be estimated twice of MD5 approximately.
of injected injected faults faults HMAC-MD4 [n/3] NMAC-MD4 2 x [n/3] HMAC-MD5 [n/3] NMAC-MD5 2 x [n/3] HMAC-SHA-224 [n/3] NMAC-SHA-224 [n/3] + [n/2] HMAC-SHA-256 [n/3] NMAC-SHA-256 2 x [n/3] HMAC-SHA-384 [n/3] NMAC-SHA-384 [n/3] + n HMAC-SHA-512 [n/3] NMAC-SHA-512 2 x [n/3] TABLE 2: Parameters of MD4, MD5 and SHA-2.
NetX/IPsec includes 3DES, AES encryption, HMAC-SHA1, and HMAC-MD5, with frameworks that allow the user to integrate their hardware cryptographic engine or software crypto library with NetX/IPsec operation.
The resulting MAC algorithm is termed HMAC-MD5 or HMAC-SHA-1 accordingly.
Any iterative cryptographic hash function, such as MD5 or SHA-1, may be used in the calculation of a HMAC; the resulting MAC algorithm is termed HMAC-MD5 or HMAC-SHA-1 accordingly.