Cryptanalysis of the public-key encryption based on braid groups

  • Authors:
  • Eonkyung Lee;Je Hong Park

  • Affiliations:
  • Cryptographic Technology Team, KISA, Seoul, South Korea;Department of Mathematics, KAIST, Taejon, South Korea

  • Venue:
  • EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
  • Year:
  • 2003

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Abstract

At CRYPTO 2000, a new public-key encryption based on braid groups was introduced. This paper demonstrates how to solve its underlying problem using the Burau representation. By this method, we show that the private-key can be recovered from the public-key for several parameters with significant probability in a reasonable time. Our attack can be mounted directly on the revised scheme mentioned at ASIACRYPT 2001 as well. On the other hand, we give a new requirement for secure parameters against our attack, which more or less conflicts with that against brute force attack.