Efficient Algorithms for Computing Differential Properties of Addition

  • Authors:
  • Helger Lipmaa;Shiho Moriai

  • Affiliations:
  • -;-

  • Venue:
  • FSE '01 Revised Papers from the 8th International Workshop on Fast Software Encryption
  • Year:
  • 2001

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Abstract

In this paper we systematically study the differential properties of addition modulo 2n. We derive 驴(log n)-time algorithms for most of the properties, including differential probability of addition.We also present log-time algorithms for finding good differentials. Despite the apparent simplicity of modular addition, the best known algorithms require naive exhaustive computation. Our results represent a significant improvement over them. In the most extreme case, we present a complexity reduction from 驴(24n) to 驴(log n).