IACR News item: 18 July 2014
Abderrahmane Nitaj, Muhammad Rezal Kamel Ariffin
ePrint Reportof the same bit-size. In 2009, May and Ritzenhofen proposed a
method to factor N1 and N2 given the implicit information that p1 and
p2 share an amount of least significant bits. In this paper, we propose a generalization of their attack as follows: suppose that some unknown multiples a1p1 and a2p2 of the prime factors p1 and p2 share an amount of their Most Significant Bits (MSBs) or an amount of their Least Significant Bits (LSBs). Using a method based on the continued fraction algorithm, we propose a method that leads to the factorization of N1 and N2. Using simultaneous diophantine approximations and lattice reduction, we extend the method to factor k 3 RSA moduli Ni = piqi, i = 1, . . . , k given the implicit information that there exist unknown multiples a1p1, . . . , akpk sharing an amount of their MSBs or their LSBs. Also, this paper extends many previous works where similar results were obtained when the pi\'s share their MSBs or their LSBs.
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