Abstract:Abstract—We propose a new double-block-length compression function which is called Alpha-DBL. This scheme uses two parallel secure single block length schemes based on a block cipher with -bit key and -bit block size to compress a -bit string to a -bit one. We show that the Alpha-DBL scheme attains nearly optimal collision security and preimage security bounds (up to and queries for finding a collision and a preimage, respectively). More precisely, for , no adversary making less than queries can find a coll… Show more
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