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Baodong Qin and Shengli Liu Efficient chosen ciphertext secure public-key encryption under factoring assumption Security and Communication Networks 6

Version of Record online: 21 JUN 2012 | DOI: 10.1002/sec.571

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In EUROCYPT 2009, Hofheinz and Kiltz proposed the first public-key encryption scheme that simultaneously enjoys practicality and IND-CCA security under factoring assumption in the standard model. In this paper, we present a variant of their scheme that performs better at decryption while having the same efficiency at encryption. By remarking that over a semismooth subgroup, we were able to construct a new scheme that performs extremely efficient decryption.

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