Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
Identity-Based Encryption from the Weil Pairing
SIAM Journal on Computing
CRYPTO '88 Proceedings of the 8th Annual International Cryptology Conference on Advances in Cryptology
ID-Based Blind Signature and Ring Signature from Pairings
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Ring signatures without random oracles
ASIACCS '06 Proceedings of the 2006 ACM Symposium on Information, computer and communications security
Efficient ring signatures without random oracles
PKC'07 Proceedings of the 10th international conference on Practice and theory in public-key cryptography
Efficient partially blind signatures with provable security
ICCSA'07 Proceedings of the 2007 international conference on Computational science and its applications - Volume Part III
Escrowed linkability of ring signatures and its applications
VIETCRYPT'06 Proceedings of the First international conference on Cryptology in Vietnam
Two improved partially blind signature schemes from bilinear pairings
ACISP'05 Proceedings of the 10th Australasian conference on Information Security and Privacy
Short linkable ring signatures revisited
EuroPKI 2006 Proceedings of the Third European conference on Public Key Infrastructure: theory and Practice
Identity-based strong multi-designated verifiers signatures
EuroPKI 2006 Proceedings of the Third European conference on Public Key Infrastructure: theory and Practice
Efficient identity-based signatures and blind signatures
CANS'05 Proceedings of the 4th international conference on Cryptology and Network Security
Efficient identity based ring signature
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Identity based ring signature: why, how and what next
EuroPKI'05 Proceedings of the Second European conference on Public Key Infrastructure
Ring signatures: stronger definitions, and constructions without random oracles
TCC'06 Proceedings of the Third conference on Theory of Cryptography
Ring signatures of sub-linear size without random oracles
ICALP'07 Proceedings of the 34th international conference on Automata, Languages and Programming
Strongly-secure identity-based key agreement and anonymous extension
ISC'07 Proceedings of the 10th international conference on Information Security
Designated verifier ring signature and ring signcryption
International Journal of Intelligent Information and Database Systems
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Blind signature and ring signature are two signature schemes with privacy concern. Zhang [Jianhong Zhang, Linkability analysis of some blind signature schemes, In International Conference on Computational Intelligence and Security 2006, IEEE, vol. 2, 2006, pp. 1367-1370, (Available at http://dx.doi.org/10.1109/ICCIAS.2006.295283.)] analyzed the unlinkability of Zhang and Kim [Fangguo Zhang, Kwangjo Kim, ID-based blind signature and ring signature from pairings, in: Yuliang Zheng (Ed.), Advances in Cryptology - ASIACRYPT 2002, 8th International Conference on the Theory and Application of Cryptology and Information Security, Queenstown, New Zealand, December 1-5, 2002, Proceedings, Lecture Notes in Computer Science, vol. 2501, Springer, 2002, pp. 533-547], Huang et al. [Zhenjie Huang, Kefei Chen, Yumin Wang, Efficient identity-based signatures and blind signatures, in: Yvo Desmedt, Huaxiong Wang, Yi Mu, Yongqing Li (Eds.), Cryptology and Network Security, 4th International Conference, CANS 2005, Xiamen, China, December 14-16, 2005, Proceedings, Lecture Notes in Computer Science, vol. 3810, Springer, 2005, pp. 120-133] and Wu et al. [Qianhong Wu, Willy Susilo, Yi Mu, Fangguo Zhang, Efficient partially blind signatures with provable security, in: Osvaldo Gervasi, Marina L. Gavrilova, (Eds.), Computational Science and Its Applications - ICCSA 2007, International Conference, Kuala Lumpur, Malaysia, August 26-29, 2007. Proceedings. Part III, Lecture Notes in Computer Science, vol. 4707, Springer, 2007, pp. 1096-1105] and claimed that they are indeed linkable. On the other hand, Gamage et al. [Chandana Gamage, Ben Gras, Bruno Crispo, Andrew S. Tanenbaum, An identity-based ring signature scheme with enhanced privacy, Securecomm and Workshops 2006, IEEE, 2006, pp. 1-5, (Available at http://dx.doi.org/10.1109/SECCOMW.2006.359554)] claimed that the scheme of Chow et al. [Sherman S.M. Chow, Siu-Ming Yiu, Lucas Chi Kwong Hui, Efficient identity based ring signature, in: John Ioannidis, Angelos D. Keromytis, Moti Yung (Eds.), Applied Cryptography and Network Security, Third International Conference, ACNS 2005, New York, NY, USA, June 7-10, 2005, Proceedings, Lecture Notes in Computer Science, vol. 3531, 2005, pp. 499-512] is vulnerable to key exposure attack. This paper shows that all these claims are incorrect. Furthermore, we show that the scheme proposed by Gamage et al. [Chandana Gamage, Ben Gras, Bruno Crispo, Andrew S. Tanenbaum, An identity-based ring signature scheme with enhanced privacy, Securecomm and Workshops 2006, IEEE, 2006, pp. 1-5, (Available at http://dx.doi.org/10.1109/SECCOMW.2006.359554)] which aimed to provide enhanced privacy actually has privacy level reduced. We hope this work can pinpoint the standard one should use when analyzing the unlinkability of blind signatures and the anonymity of ring signatures.