Cryptology ePrint Archive: Report 2008/204

Cryptanalysis of the Cai-Cusick Lattice-based Public-key Cryptosystem

Yanbin Pan and Yingpu Deng

Abstract: In 1998, Cai and Cusick proposed a lattice-based public-key cryptosystem based on the similar ideas of the Ajtai-Dwork cryptosystem, but with much less data expansion. However, they didn't give any security proof. In our paper, we present an efficient ciphertext-only attack which runs in polynomial time against the cryptosystem to recover the message, so the Cai-Cusick lattice-based public-key cryptosystem is not secure. We also present two chosen-ciphertext attacks to get a similar private key which acts as the real private key.

Category / Keywords: public-key cryptography /

Date: received 9 May 2008

Contact author: panyanbin at amss ac cn

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Version: 20080513:010222 (All versions of this report)

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