Welcome to the resource topic for 2008/496
Title:
Constructing Variable-Length PRPs and SPRPs from Fixed-Length PRPs
Authors: Debra L. Cook, Moti Yung, Angelos Keromytis
Abstract:We create variable-length pseudorandom permutations (PRPs) and strong PRPs (SPRPs) accepting any input length chosen from the range of b to 2b bits from fixed-length, b-bit PRPs. We utilize the elastic network that underlies the recently introduced concrete design of elastic block ciphers, exploiting it as a network of PRPs. We prove that three and four-round elastic networks are variable-length PRPs and five-round elastic networks are variable-length SPRPs, accepting any input length that is fixed in the range of b to 2b bits, when the round functions are independently chosen fixed-length PRPs on b bits. We also prove that these are the minimum number of rounds required.
ePrint: https://eprint.iacr.org/2008/496
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