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Title : VMAC: Message Authentication Code using Universal Hashing
Author(s) : T. Krovetz
Filename : draft-krovetz-vmac-00.txt
Pages : 20
Date : 2006-11-8
This specification describes how to generate an authentication tag
using the VMAC message authentication algorithm. VMAC is designed to
have exceptional performance in software on 64-bit CPU architectures
while performing well on 32-bit architectures. Measured speeds are
as low as one-half CPU cycle per byte on the 64-bit Intel Core 2
architecture, and under five cycles per byte on recent 32-bit PowerPC
and Intel processors.
To generate the authentication tag on a given message, a "universal"
hash function 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. VMAC tags can be either 64 or 128 bits
in length and have proven forgery probabilities on the order of
1/2"59 and 1/2"94, respectively.
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