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Cryptanalysis of Improved Rabin′s Cryptosystem

LI Zi chen 1,WANG Yong chuan 2,ZENG Zhi feng 2,YANG Yi xian 2,WU Wei ling 2(1.Depart.of Computer Science and Technology,Jiaoguo Institute of Technology,Jiaofuo 454159,China; 2.Information Security Center,Beijing University of Posts and Telecomm  
Shamir and Schorr proposed an attack to Rabin's digital signature.The attack is called Shamir attack.In this paper,we will present a new and efficient bit perturbing method to avoid the Shamir attack.Harn and Kiesler proposed a public key cryptosystem,digital signature and authentic encryption scheme based on Rabin's cryptosystem.In this paper,we will point out these cryptosystem are insecure and we also propose a secure digital signature scheme.
【Fund】: 国家自然科学基金!(No .69772 0 35;69882 0 0 2 ;698962 4 0 )
【CateGory Index】: TN918.4
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