Advances in Cryptology — EUROCRYPT ’97

Volume 1233 of the series Lecture Notes in Computer Science pp 27-36


A New Public-Key Cryptosystem

  • David NaccacheAffiliated withGemplus Card International
  • , Jacques SternAffiliated withEcole Normale Supérieure


This paper describes a new public-key cryptosystem where the ciphertext is obtained by multiplying the public-keys indexed by the message bits and the cleartext is recovered by factoring the ciphertext raised to a secret power. Encryption requires four multiplications / byte and decryption is roughly equivalent to the generation of an RSA signature.