Poly1305-AES is a state-of-the-art secret-key message-authentication
code suitable for a wide variety of applications.

Poly1305-AES computes a 16-byte authenticator of a message of any
length, using a 16-byte nonce (unique message number) and a 32-byte
secret key. Attackers can't modify or forge messages if the message
sender transmits an authenticator along with each message and the
message receiver checks each authenticator.

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