Known Issues With Application of Forking Lemma
The reduction provided by the forking lemma is not a tight reduction. Pointcheval and Stern proposed security arguments for Digital Signatures and Blind Signature using Forking Lemma. Claus P. Schnorr provided an attack on blind Schnorr signatures schemes, which were argued to be secure by Pointcheval and Stern. Schnorr also suggested enhancements for securing blind signatures schemes based on discrete logarithm problem.
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