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Forgery attacks on Kang et al.'s identity-based strong designated verifier signature scheme and its improvement with security proof
- Authors
- Lee, Ji-Seon; Chang, Jik Hyun; Lee, Dong Hoon
- Issue Date
- Sep-2010
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Cryptography; Identity-based signatures; Strong designated verifier signatures; Proxy signatures; Universal forgery attack
- Citation
- COMPUTERS & ELECTRICAL ENGINEERING, v.36, no.5, pp.948 - 954
- Indexed
- SCIE
SCOPUS
- Journal Title
- COMPUTERS & ELECTRICAL ENGINEERING
- Volume
- 36
- Number
- 5
- Start Page
- 948
- End Page
- 954
- ISSN
- 0045-7906
- Abstract
- 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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Related Researcher
- Lee, Dong Hoon
- Department of Information Security