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.
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