Security Analysis and Improvement of the Signcryption-based Fair Exchange Protocol

doi:10.13190/jbupt.201106.38.sunyb

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2011, Vol. 34 ›› Issue (6): 38-41.doi: 10.13190/jbupt.201106.38.sunyb

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Security Analysis and Improvement of the Signcryption-based Fair Exchange Protocol

Received:2011-03-17 Revised:2011-05-04 Online:2011-12-28 Published:2011-10-18

Abstract

Abstract:

Recently, Luo et al. used their signcryption-based concurrent signature scheme to design a fair exchange protocol, and they claimed that their schemes are secure. Through security analysis, their signcryption-based concurrent signature is insecure. If the receiver has a valid ambiguous signature of the signer, without the signer’s keystone and secret key, he can obtain the signer’s message and forge an ambiguous signature on arbitrary message on behalf of the signer easily. So, the fair exchange protocol is insecure. Then, an improved signcrytion-base concurrent signature was presented which overcame the flaw of the previous scheme, which ensured the security of the fair exchange protocol.

CLC Number:

TP393

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Security Analysis and Improvement of the Signcryption-based Fair Exchange Protocol

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