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The Pseudorandomness of Elastic Block Ciphers

Cook, Debra L.; Yung, Moti; Keromytis, Angelos D.

We investigate elastic block ciphers, a method for constructing variable length block ciphers, from a theorectical perspective. We view the underlying structure of an elastic block cipher as a network, which we refer to as an elastic network, and analyze the network in a manner similar to the analysis performed by Luby and Rackoff on Fesitel networks. We prove that a three round elastic network is a pseudorandom permutation and a four round network is a strong pseudorandom permutation when the round functions are pseudorandom permutations.



More About This Work

Academic Units
Computer Science
Department of Computer Science, Columbia University
Columbia University Computer Science Technical Reports, CUCS-037-05
Published Here
April 21, 2011