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GEM: A
G
eneric Chosen-Ciphertext Secure
E
ncryption
M
ethod
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GEM: A Generic Chosen-Ciphertext Secure Encryption Method
Jean-Sébastien Coron 5  , Helena Handschuh5 , Marc Joye6 , Pascal Paillier5 , David Pointcheval7 and Christophe Tymen5, 7
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Gemplus Card International, 34 rue Guynemer, 92447 Issy-les-Moulineaux, France |
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Gemplus Card International, Parc d’Activités de Gémenos, B.P. 100, 13881 Gémenos Cedex, France |
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Computer Science Department, École Normale Supérieure, 45 rue d’Ulm, 75230 Paris Cedex 05, France |
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.
Keywords Public-key encryption - hybrid encryption - chosen-ciphertext security - random oracle model - generic conversion - block ciphers - stream ciphers
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