Proving security against chosen cyphertext attacks

  • Authors:
  • M. Blum;P. Feldman;S. Micali

  • Affiliations:
  • -;-;-

  • Venue:
  • CRYPTO '88 Proceedings on Advances in cryptology
  • Year:
  • 1990

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Abstract

The relevance of zero knowledge to cryptography has become apparent in the recent years. In this paper we advance this theory by showing that interaction in any zero-knowledge proof can be replaced by sharing a common, short, random string. This advance finds immediate application in the construction of the first public-key cryptosystem secure against chosen ciphertext attack.Our solution, though not yet practical, is of theoretical significance, since the existence of cryptosystems secure against chosen ciphertext attack has been a famous long-standing open problem in the field.