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There is a great similarity between the zero-knowledge proof of quadratic residuocity presented by Goldwasser-Micali-Rackoff and the graph isomorphism proof presented by Goldreich-Micali-Wigderson. There is also a resemblance between the zero-knowledge proofs of Fiat-Shamir, Chaum-Evertse-van de Graaf, Beth and Guillou-Quisquater. A similar observation holds for zero-knowledge proofs based on encryption:...
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