GEM: A Generic Chosen-Ciphertext Secure Encryption Method

  • Authors:
  • Jean-Sébastien Coron;Helena Handschuh;Marc Joye;Pascal Paillier;David Pointcheval;Christophe Tymen

  • Affiliations:
  • -;-;-;-;-;-

  • Venue:
  • CT-RSA '02 Proceedings of the The Cryptographer's Track at the RSA Conference on Topics in Cryptology
  • Year:
  • 2002

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Abstract

This paper proposes an efficient and provably secure transform to encrypt a message with any asymmetric one-way cryptosystem. The resulting scheme achieves adaptive chosen-ciphertext security in the random oracle model.Compared to previous known generic constructions (Bellare, Rogaway, Fujisaki, Okamoto, and Pointcheval), our embedding reduces the encryption size and/or speeds up the decryption process. It applies to numerous cryptosystems, including (to name a few) ElGamal, RSA, Okamoto-Uchiyama and Paillier systems.