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CCA secure ElGamal encryption over an integer group where ICDH assumption holds
[article]
2022
IACR Cryptology ePrint Archive
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In order to prove the ElGamal CCA (Chosen Ciphertext Attack) security in the random oracle model, it is necessary to use the group (i.e., ICDH group) where ICDH assumption holds. Until now, only bilinear group where ICDH assumption is equivalent to CDH assumption has been known as the ICDH group. In this paper, we introduce another ICDH group in which ICDH assumption holds under the RSA assumption. Based on this group, we propose the CCA secure ElGamal encryption. And we describe the
dblp:journals/iacr/KimSJ22
fatcat:cjhd2t5yjva47pa2bk447ec7re