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This specification describes how to generate an authentication tagusing the UMAC message authentication algorithm. UMAC is designed tobe very fast to compute in software on contemporary uniprocessors.Measured speeds are as low as one cycle per byte. UMAC relies onaddition of 32-bit and 64-bit numbers and multiplication of 32-bitnumbers, operations well-supported by contemporary machines. Togenerate the authentication tag on a given message, a "universal" hashfunction is applied to the message and key to produce a short, fixed-length hash value, and this hash value is then xor'ed with a key-derived pseudorandom pad. UMAC enjoys a rigorous security analysis,and its only internal "cryptographic" component is a block cipher usedto generate the pseudorandom pads and internal key material. This memoprovides information for the Internet community.

UMAC: Message Authentication Code using Universal Hashing