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International Association for Cryptologic Research (IACR)
Abstract
Let N=pq be an RSA modulus with unknown factorization. Some variants of the RSA cryptosystem, such as LUC, RSA with Gaussian primes and RSA type schemes based on singular elliptic curves use a public key e and a private key d satisfying an equation of the form ed−k(p2−1)(q2−1)=1. In this paper, we consider the general equation ex−(p2−1)(q2−1)y=z and present a new attack that finds the prime factors p and q in the case that x, y and z satisfy a specific condition. The attack combines the continued fraction algorithm and Coppersmith\u27s technique and can be seen as a generalization of the attacks of Wiener and Blömer-May on RSA
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