Maher Boudabra, Abderrahmane Nitaj

A New RSA Variant Based on Elliptic Curves

  • Applied Mathematics
  • Computational Theory and Mathematics
  • Computer Networks and Communications
  • Computer Science Applications
  • Software

In this paper, we propose a new scheme based on ephemeral elliptic curves over a finite ring with an RSA modulus. The new scheme is a variant of both the RSA and the KMOV cryptosystems and can be used for both signature and encryption. We study the security of the new scheme and show that it is immune to factorization attacks, discrete-logarithm-problem attacks, sum-of-two-squares attacks, sum-of-four-squares attacks, isomorphism attacks, and homomorphism attacks. Moreover, we show that the private exponents can be much smaller than the ordinary exponents in RSA and KMOV, which makes the decryption phase in the new scheme more efficient.

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