CCM (Counter with CBC-MAC) is a mode of operation for cryptographic Block Ciphers.

CCM mode is an authenticated encryption algorithm designed to provide both authentication and confidentiality.

CCM mode is only defined for Block Ciphers with a block length of 128 bits.

The nonce of CCM must be carefully chosen to never be used more than once for a given key. This is because CCM is a derivation of CTR mode and the latter is effectively a Stream Cipher.

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