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Description: Message Authentication Code. Uses a 32-byte one-time key and a message to produce a 16-byte tag.
Poly1305 is a message authentication code (MAC) created by Daniel Bernstein. Poly1305 takes a 32-byte one-time key and a message to produce a 16-byte tag. The tag is then used to authenticate the message. Whenever Poly1305 is used as a MAC algorithm it is necessary to allocate 256 bits to the integrity key.
Google selected Poly1305 and ChaCha20 as a replacement for RC4 in TLS/SSL. OpenSSH added support for Poly1305 with ChaCha20 in v6.5. The NaCl crypto library uses Poly1305 with XSalsa20 .
Poly1305 is biased. Poly1305 is not a suitable choice for a Pseudo-Random Function (PRF). Using it for key derivation would reduce the security of symmetric encryption.
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