Abstract
A group signature scheme allows the group member to sign messages on behalf of a group. In 1996, Kim et al. proposed a new type of group signature, called “convertible group signature”. Recently, Saeednia pointed out that there are weaknesses in a convertible group signature scheme proposed by Kim et al. Furthermore, Saeednia proposed a modified scheme to eliminate these weaknesses. In this paper, we show that there is a way to forge a group signature even if adopting Saeednia’s modified scheme.
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References
D. Chaum and E. van Heyst, “Group signatures,” in Advances in Cryptology (Proceedings of EuroCrypt’91), pp. 47–53, Lecture Notes in Computer Science, Springer-Verlag, Berlin, 1992.
S. J. Kim, S. J. Park, and D. H. Won, “Convertible group signatures,” in Advances in Cryptology (Proceedings of AsiaCrypt’96), pp. 311-321, Lecture Notes in Computer Science, Springer-Verlag, Berlin, 1996.
S. Saeednia, “On the security of a convertible group signature scheme,” Information Processing Letters, vol. 73, pp. 93–96, Feb. 2000.
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Chin-Chen, C., Kuo-Feng, H. (2001). Towards the Forgery of a Group Signature without Knowing the Group Center's Secret. In: Qing, S., Okamoto, T., Zhou, J. (eds) Information and Communications Security. ICICS 2001. Lecture Notes in Computer Science, vol 2229. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45600-7_6
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DOI: https://doi.org/10.1007/3-540-45600-7_6
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