Cryptanalysis and improvement of signcryption schemes
نویسنده
چکیده
In 1997, two new schemes for authenticated encryption, called signcryption, have been proposed by Zheng. In this paper we point out a serious problem with these schemes. In fact, the way to gain nonrepudiation violates the confidentiality. Moreover, we compare the schemes to previously known authenticated encryption schemes, which were not mentioned by Zheng. Finally we outline a solution that overcomes the weakness.
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تاریخ انتشار 2005