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On the Security Loss of Unique Signatures
unique signatures security loss black-box impossibility
2018/11/9
We consider the question of whether the security of unique digital signature schemes can be based on game-based cryptographic assumptions using linear-preserving black-box security reductions—that is,...
Optimal Security Reductions for Unique Signatures: Bypassing Impossibilities with A Counterexample
Unique Signatures Tight Reduction Impossibility
2017/6/2
Optimal security reductions for unique signatures (Coron, Eurocrypt 2002) and their generalization, i.e., efficiently re-randomizable signatures (Hofheinz et al., PKC 2012 and Baderet al., Eurocrypt 2...