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GCM was designed by John Viega and David A. McGrew to be an improvement to Carter–Wegman counter mode (CWC mode). [4] In November 2007, NIST announced the release of NIST Special Publication 800-38D Recommendation for Block Cipher Modes of Operation: Galois/Counter Mode (GCM) and GMAC making GCM and GMAC official standards. [5]
Galois/counter mode (GCM) combines the well-known counter mode of encryption with the new Galois mode of authentication. The key feature is the ease of parallel computation of the Galois field multiplication used for authentication. This feature permits higher throughput than encryption algorithms.
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In Sophie Germain Counter Mode, it was proposed to use the arithmetic in the finite field of order equal to the safe prime 2 128 + 12451, to counter weaknesses in Galois/Counter Mode using the binary finite field GF(2 128). However, SGCM has been shown to be vulnerable to many of the same cryptographic attacks as GCM. [26]
Counter mode with CBC-MAC (CCM) Galois/Counter Mode (GCM) Cipher Block Chaining (CBC) with HMAC-Secure Hash Algorithm; XTS-HMAC-Secure Hash Algorithm; The P1619.2 Standard for Wide-Block Encryption for Shared Storage Media has proposed algorithms including: Extended Codebook (XCB) Encrypt Mix Encrypt V2 (EME2)
The basic operations of the LRW mode (AES cipher and Galois field multiplication) are the same as the ones used in the Galois/Counter Mode (GCM), thus permitting a compact implementation of the universal LRW/XEX/GCM hardware. The original XEX has a weakness. [12]
A default cipher suite of GCM-AES-128 (Galois/Counter Mode of Advanced Encryption Standard cipher with 128-bit key) GCM-AES-256 using a 256 bit key was added to the standard 5 years later. Security tag inside each frame in addition to EtherType includes: association number within the channel
For traffic flow, AES should be used with either the Counter Mode (CTR) for low bandwidth traffic or the Galois/Counter Mode (GCM) mode of operation for high bandwidth traffic (see Block cipher modes of operation) – symmetric encryption; Elliptic Curve Digital Signature Algorithm (ECDSA) – digital signatures