Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
Unique Signatures and Verifiable Random Functions from the DH-DDH Separation
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Certificateless signature: a new security model and an improved generic construction
Designs, Codes and Cryptography
ASIACCS '07 Proceedings of the 2nd ACM symposium on Information, computer and communications security
Malicious KGC attacks in certificateless cryptography
ASIACCS '07 Proceedings of the 2nd ACM symposium on Information, computer and communications security
Certificateless signature revisited
ACISP'07 Proceedings of the 12th Australasian conference on Information security and privacy
Generic certificateless encryption in the standard model
IWSEC'07 Proceedings of the Security 2nd international conference on Advances in information and computer security
An efficient certificateless signature scheme
CIS'05 Proceedings of the 2005 international conference on Computational Intelligence and Security - Volume Part II
On the security of certificateless signature schemes from asiacrypt 2003
CANS'05 Proceedings of the 4th international conference on Cryptology and Network Security
On constructing certificateless cryptosystems from identity based encryption
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
Certificateless public-key signature: security model and efficient construction
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
Efficient identity-based signatures secure in the standard model
ACISP'06 Proceedings of the 11th Australasian conference on Information Security and Privacy
Key replacement attack against a generic construction of certificateless signature
ACISP'06 Proceedings of the 11th Australasian conference on Information Security and Privacy
Certificateless signcryption scheme in the standard model
Information Sciences: an International Journal
Forward-secure identity-based signature: Security notions and construction
Information Sciences: an International Journal
Security Pitfalls of the Certificateless Signature and Multi-Receiver Signcryption Schemes
Fundamenta Informaticae
Cryptanalysis and improvement of a certificateless threshold signature secure in the standard model
Information Sciences: an International Journal
Provable certificateless generalized signcryption scheme
Designs, Codes and Cryptography
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In ASIACCS 2007, Liu et al proposed a certificateless signature scheme which is provably secure in the standard model. However, as we will show in this paper, the proposed scheme is insecure against a malicious-but-passive KGC attack. This implies that the malicious-but-passive KGC, which generates system parameters based on the information of the target user, can forge valid signatures for that signer without being detected. Furthermore, we propose an improved scheme that remedies the weakness of Liu et al's scheme. The improved scheme can be proven secure against malicious-but-passive KGC attack in the standard model.