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A new security proof for Damgård’s ElGamal
Authors: Kristian GjøsteenAbstract:
We provide a new security proof for a variant of ElGamal proposed by Damgård, showing that it is secure against non-adaptive chosen ciphertext. Unlike previous security proofs for this cryptosystem, which rely on somewhat problematic assumptions, our computational problem is similar to accepted problems such the Gap and Decision Diffie-Hellman problems.
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