期刊
COMPUTERS & ELECTRICAL ENGINEERING
卷 36, 期 5, 页码 948-954出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compeleceng.2010.02.001
关键词
Cryptography; Identity-based signatures; Strong designated verifier signatures; Proxy signatures; Universal forgery attack
Recently, Kang et al. proposed a new identity-based strong designated verifier signature scheme (ID-SDVS) and identity-based designated verifier proxy signature scheme (ID-DVPS). They claimed that their schemes are unforgeable. However, we found out that their schemes are universally forgeable in the sense that anyone can forge valid ID-SDVS and ID-DVPS on an arbitrary message without the knowledge of the secret key of either the signer or the designated verifier. Finally, we propose an improved ID-SDVS which is unforgeable. We give formal security proof of universal unforgeability of our scheme. We also give an improved ID-DVPS. (C) 2010 Elsevier Ltd. All rights reserved.
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