Ciphers with Arbitrary Finite Domains

  • Authors:
  • John Black;Phillip Rogaway

  • Affiliations:
  • -;-

  • Venue:
  • CT-RSA '02 Proceedings of the The Cryptographer's Track at the RSA Conference on Topics in Cryptology
  • Year:
  • 2002

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Abstract

We explore the problem of enciphering members of a finite set M where k = |M| is arbitrary (in particular, it need not be a power of two). We want to achieve this goal starting from a block cipher (which requires a message space of size N = 2n, for some n). We look at a few solutions to this problem, focusing on the case when M= [O, k - 1]. We see ciphers with arbitrary domains as a worthwhile primitive in its own right, and as a potentially useful one for making higher-level protocols.