Cryptanalytic results on `Dual CRT' and `Common Prime' RSA

  • Authors:
  • Santanu Sarkar;Subhamoy Maitra

  • Affiliations:
  • Applied Statistics Unit, Indian Statistical Institute, Kolkata, India 700108;Applied Statistics Unit, Indian Statistical Institute, Kolkata, India 700108

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2013

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Abstract

In this paper we study weaknesses of two variants of RSA: Dual RSA and Common Prime RSA. Several schemes under the framework of Dual RSA have been proposed by Sun et al. (IEEE Trans Inf Theory 53(8):2922---2933, 2007). We here concentrate on the Dual CRT-RSA scheme and present certain range of parameters where it is insecure. As a corollary of our work, we prove that the Dual Generalized Rebalanced-RSA (Scheme III of Sun et al.) can be efficiently broken for a significant region where the scheme has been claimed to be secure. Next we consider the Common Prime RSA as proposed by Wiener (IEEE Trans. Inf. Theory 36:553---558, 1990). We present new range of parameters in Common Prime RSA where it is not secure. We use lattice based techniques for the attacks.