Possibility of decryption speed-up by parallel processing in CCA secure hashed ElGamal
Gyu Chol Kim,
Hyon A. Ji,
Yong Bok Jong
et al.
Abstract:In order to prove the ElGamal CCA(Chosen Ciphertext Attack) security in the random oracle model, it is necessary to use the group where ICDH(Interactive Computational Diffie Hellman) assumption holds. Until now, only bilinear group with complex algebraic structure has been known as the ICDH group. In this paper, we introduce the ICDH group with simple algebraic structure. In other words, we prove that ICDH assumption holds in the integer group with composite modulus. On the basis of this, we propose the CCA se… Show more
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