The main advantage of this is that it uses the Galois field to verify data without the need for an outside algorithm. It is increasingly common, however, to see AES used in Galois/counter (GCM) mode, which uses the counter mode of encryption. When used in CBC mode, a HMAC hashing algorithm such as HMAC-SHA256 is required to verify the data.
Jan 6 15:52:37 ovpn-client5: Control Channel: TLSv1.3, cipher TLSv1.3 TLS_AES_256_GCM_SHA384, peer certificate: 4096 bit RSA, signature: RSA-SHA512ĪES-CBC vs AES-GCMUntil fairly recently, AES was usually used in cipher block chaining (CBC) mode, where each block of plaintext is XORed with the previous ciphertext block before being encrypted. Jan 6 15:52:37 ovpn-client5: Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Jan 6 15:52:37 ovpn-client5: Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
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