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A Simple Algorithm for Fast Correlation Attacks on Stream Ciphers

  • Vladimor V. Chepyzhov
  • Thomas Johansson
  • Ben Smeets
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1978)

Abstract

A new simple algorithm for fast correlation attacks on stream ciphers is presented. The advantages of the new approach are at least two. Firstly, the new algorithm significantly reduces the memory requirements compared with some recent proposals [2],[3]. This allows more powerful attacks than previously. Secondly, the simplicity of the algorithm allows us to derive theoretical results. We determine the relation between the number of observed symbols, the correlation probability, and the allowed computational complexity, required for a successful attack. Hence, we can get theoretical estimates on the required computational complexity in cases when simulation is not possible.

Keywords

Stream ciphers correlation attacks cryptanalysis 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Vladimor V. Chepyzhov
    • 1
  • Thomas Johansson
    • 2
  • Ben Smeets
    • 3
  1. 1.Institute for Problems of Information TransmissionRussian Academy of SciencesMoscowRussia
  2. 2.Dept. of Information TechnologyLund UniversityLundSweden
  3. 3.Ericsson Mobile CommunicationsLundSweden

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