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GCM uses a block cipher with block size 128 bits (commonly AES-128) operated in counter mode for encryption, and uses arithmetic in the Galois field GF(2 128) to compute the authentication tag; hence the name. Galois Message Authentication Code (GMAC) is an authentication-only variant of the GCM which can form an incremental message ...
GCM is defined for block ciphers with a block size of 128 bits. Galois message authentication code (GMAC) is an authentication-only variant of the GCM which can form an incremental message authentication code. Both GCM and GMAC can accept initialization vectors of arbitrary length.
Galois Message Authentication Code, a type of cryptographic message authentication code; Giga multiply–accumulate operations per second, a rate of multiply–accumulate operations; Gigabit media access controller, for handling an Ethernet physical transceiver; See Gigabit Ethernet
Like Galois/Counter Mode, AES-GCM-SIV combines the well-known counter mode of encryption with the Galois mode of authentication. The key feature is the use of a synthetic initialization vector (SIV) which is computed with Galois field multiplication using a construction called POLYVAL (a little-endian variant of Galois/Counter Mode's GHASH).
It should be computationally infeasible to compute a valid tag of the given message without knowledge of the key, even if for the worst case, we assume the adversary knows the tag of any message but the one in question. [3] Formally, a message authentication code (MAC) system is a triple of efficient [4] algorithms (G, S, V) satisfying:
This category is about the cryptographic methods called message authentication codes (MACs). (See also the related category Cryptographic hash functions .) Pages in category "Message authentication codes"
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RFC 4543: The Use of Galois Message Authentication Code (GMAC) in IPsec ESP and AH; RFC 4555: IKEv2 Mobility and Multihoming Protocol (MOBIKE) RFC 4806: Online Certificate Status Protocol (OCSP) Extensions to IKEv2; RFC 4868: Using HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512 with IPsec