Improved Cryptanalysis of the Self-Shrinking Generator

  • Authors:
  • Erik Zenner;Matthias Krause;Stefan Lucks

  • Affiliations:
  • -;-;-

  • Venue:
  • ACISP '01 Proceedings of the 6th Australasian Conference on Information Security and Privacy
  • Year:
  • 2001

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Abstract

We propose a new attack on the self-shrinking generator [8]. The attack is based on a backtracking algorithm and will reconstruct the key from a short sequence of known keystream bits.W e give both mathematical and empirical evidence for the effectiveness of this attack. The algorithm takes at most O(20.694L) steps, where L is the key length. Thus, our attack is more efficient than previously known key reconstruction algorithms against the self-shrinking generator that operate on short keystream sequences.