Galois/Counter Mode

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In cryptography, Galois/Counter Mode (GCM) is a mode of operation for symmetric-key cryptographic block ciphers. The proposal was first published in 2007. The GCM algorithm belongs to the class of authenticated encryption with associated data (AEAD) methods. Given a key K {\displaystyle K} , plaintext P {\displaystyle P} , and associated data A D {\displaystyle AD} , GCM encrypts P {\displaystyle P} to produce ciphertext C {\displaystyle C} and an authentication tag T {\displaystyle T} . T {\displaystyle T} is computed from the ciphertext and the unencrypted associated data. A recipient who knows K {\displaystyle K} can use the tag to verify...

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