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HCH: A New Tweakable Enciphering Scheme Using the Hash-Encrypt-Hash Approach

  • Debrup Chakraborty
  • Palash Sarkar
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4329)

Abstract

The notion and the first construction of a tweakable enciphering scheme, called CMC, was presented by Halevi-Rogaway at Crypto 2003. In this paper, we present HCH, which is a new construction of such a scheme. The construction uses the hash-encrypt-hash approach introduced by Naor-Reingold. This approach has recently been used in the constructions of tweakable enciphering schemes HCTR and PEP. HCH has several advantages over the previous schemes CMC, EME, EME*, HCTR, and PEP. CMC, EME, and EME* use two block-cipher invocations per message block, while HCTR, PEP, and HCH use only one. PEP uses four multiplications per block, while HCTR and HCH use only two. In HCTR, the security bound is cubic, while in HCH security bound is quadratic.

Keywords

modes of operations tweakable encryption strong pseudo-random permutation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Debrup Chakraborty
    • 1
  • Palash Sarkar
    • 2
  1. 1.Computer Science DepartmentCINVESTAV-IPNMexicoMexico
  2. 2.Applied Statistics UnitIndian Statistical InstituteKolkataIndia

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