GCM
acronymcryptography
Stands for: Galois/Counter Mode
An AEAD mode that turns AES into an authenticated cipher using a counter and a nonce.
Galois/Counter Mode (NIST SP 800-38D) provides both encryption and integrity in one pass and is the most common AEAD mode in TLS. Its one sharp edge: reusing a nonce with the same key collapses its security entirely.
Also known as: gcm