2012•Computer Engineering and Applications JournalOpen access

Cryptanalysis and improvement of threshold signcryption scheme

Yongbing Wang

Abstract

Through the cryptanalysis of a generalized group-oriented threshold signcryption scheme,it is found that the scheme can not resist conspiracy attack,and KDC can forge valid threshold signcryption at random.It is not provided with semantic security.The third party can decrypt signcryption.An improved scheme is proposed,which overcomes the security drawbacks and retains the merits of the original scheme.

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Key concepts: Signcryption, Cryptanalysis, Scheme (mathematics), Computer science, Cryptography, Encryption, Theoretical computer science, Computer security