Pointcheval–Stern signature algorithm

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In cryptography, the Pointcheval–Stern signature algorithm is a digital signature scheme based on the closely related ElGamal signature scheme. It changes the ElGamal scheme slightly to produce an algorithm which has been proven secure in a strong sense against adaptive chosen-message attacks, assuming the discrete logarithm problem is intractable in a strong sense.[1][2]

David Pointcheval and Jacques Stern developed the forking lemma technique in constructing their proof for this algorithm. It has been used in other security investigations of various cryptographic algorithms.


  1. ^ D Pointcheval and J Stern. Security proofs for signature schemes. in U Maurer, ed. Adv in Crypt – Eurocrypt '96, 387–398, Springer-Verlag, 1996. Lect Notes in Comp Sci, nr 1070
  2. ^ Pointcheval, David; Stern, Jacques (2000). "Security Arguments for Digital Signatures and Blind Signatures" (PDF). Cryptology. 13 (3): 361–396. doi:10.1007/s001450010003. S2CID 1912537.