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Journal of Inforamtion Science and Engineering, Vol.18 No.1, pp.19-22 (January 2002)

On the Security of a Variation of Cramer-Shoup's
Public Key Scheme

Hung-Min Sun
Department of Computer Science and Information Engineering
National Cheng Kung University
Tainan, 701 Taiwan
E-mail: hmsun@mail.ncku.edu

In this paper, we show that a recently proposed variation of Cramer-Shoups public key scheme is insecure against the adaptive chosen ciphertext attack. Moreover, we showed that the proposed scheme doesnt satisfy the non-malleability property, even under the weakest attack model ? the chosen plaintext attack.

Keywords: cryptology, security, public-key cryptosystem, encryption, cryptanalysis

Full Text () Retrieve PDF document (200201_02.pdf)

Received March 1, 2000; accepted July 13, 2000.
Communicated by Hsu-Chun Yen.