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In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity-checking a message. In other words, it is used to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity).
HMAC-SHA1 generation. In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key.
In cryptography, a universal hashing message authentication code, or UMAC, is a message authentication code (MAC) calculated using universal hashing, which involves choosing a hash function from a class of hash functions according to some secret (random) process and applying it to the message. The resulting digest or fingerprint is then ...
Cryptographic hash functions have many information-security applications, notably in digital signatures, message authentication codes (MACs), and other forms of authentication. They can also be used as ordinary hash functions , to index data in hash tables , for fingerprinting , to detect duplicate data or uniquely identify files, and as ...
Message authentication or data origin authentication is an information security property that indicates that a message has not been modified while in transit (data integrity) and that the receiving party can verify the source of the message. [1] Message authentication does not necessarily include the property of non-repudiation. [2] [3]
The original specification [1] [2] of the MAA was given in a combination of natural language and tables, complemented by two implementations in C and BASIC programming languages. The MAA was adopted by ISO in 1987 and became part of international standards ISO 8730 [ 3 ] [ 4 ] and ISO 8731-2 [ 5 ] intended to secure the authenticity and ...
Most hash functions are built on an ad-hoc basis, where the bits of the message are nicely mixed to produce the hash. Various bitwise operations (e.g. rotations), modular additions , and compression functions are used in iterative mode to ensure high complexity and pseudo-randomness of the output.
HKDF is a simple key derivation function (KDF) based on the HMAC message authentication code. [1] [2] It was initially proposed by its authors as a building block in various protocols and applications, as well as to discourage the proliferation of multiple KDF mechanisms. [2]