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The CCA2-Security of Hybrid Damgård's ElGamal
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Abstract: | We consider a hybrid version of Damgård's ElGamal public-key encryption scheme that incorporates the use of a symmetric cipher and a hash function for key-derivation. We prove that under appropriate choice of the hash function this scheme is IND-CCA secure under the Decisional Diffie-Hellman assumption in the standard model. Our results can be generalized to universal hash proof systems where our main technical contribution can be viewed as an efficient generic transformation from 1-universal to 2-universal hash proof systems. |
BibTeX
@misc{eprint-2008-17981, title={The CCA2-Security of Hybrid Damgård's ElGamal}, booktitle={IACR Eprint archive}, keywords={public-key cryptography / Chosen-ciphertext security, hybrid encryption, hash proof systems, ElGamal}, url={http://eprint.iacr.org/2008/304}, note={ kiltz@cwi.nl 14067 received 7 Jul 2008}, author={Eike Kiltz and Krzysztof Pietrzak and Martijn Stam and Moti Yung}, year=2008 }