TY  - INPR
A1  - Schnorr, Claus Peter
T1  - Enhancing the security of perfect blind DL-signatures
N2  - We enhance the security of Schnorr blind signatures against the novel one-more-forgery of Schnorr [Sc01] andWagner [W02] which is possible even if the discrete logarithm is hard to compute. We show two limitations of this attack. Firstly, replacing the group G by the s-fold direct product G exp(×s) increases the work of the attack, for a given number of signer interactions, to the s-power while increasing the work of the blind signature protocol merely by a factor s. Secondly, we bound the number of additional signatures per signer interaction that can be forged effectively. That fraction of the additional forged signatures can be made arbitrarily small.
Y1  - 2003
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4285
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-12083
UR  - http://www.mi.informatik.uni-frankfurt.de/research/papers.html
N1  - Preprint, Dec. 2003 (preliminary version), später in: Information Sciences, 176.2006, S. 1305-1320
ER  -