Another look at small RSA exponents

  • Authors:
  • M. Jason Hinek

  • Affiliations:
  • School of Computer Science, University of Waterloo, Waterloo, Ontario, Canada

  • Venue:
  • CT-RSA'06 Proceedings of the 2006 The Cryptographers' Track at the RSA conference on Topics in Cryptology
  • Year:
  • 2006

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Abstract

In this work we consider a variant of RSA whose public and private exponents can be chosen significantly smaller than in typical RSA. In particular, we show that it is possible to have private exponents smaller than N1/4 which are resistant to all known small private exponent attacks. This allows for instances of RSA with short CRT-exponents and short public exponents. In addition, the number of bits required to store the private key information can be significantly reduced in this variant.