[Resource Topic] 2002/109: A New Class of Unsafe Primes

Welcome to the resource topic for 2002/109

Title:
A New Class of Unsafe Primes

Authors: Qi Cheng

Abstract:

In this paper,
a new special-purpose factorization algorithm is presented,
which finds a prime factor p of an integer n
in polynomial time, if 4p-1 has the form
d b^2 where d \in \{3, 11, 19, 43, 67, 163\}
and b is an integer.
Hence such primes should be avoided when we select the
RSA secret keys. Some generalizations of the algorithm are
discussed in the paper as well.

ePrint: https://eprint.iacr.org/2002/109

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