The Insecurity of Nyberg-Rueppel and Other DSA-Like Signature Schemes with Partially Known Nonces

  • Authors:
  • Edwin El Mahassni;Phong Q. Nguyen;Igor Shparlinski

  • Affiliations:
  • -;-;-

  • Venue:
  • CaLC '01 Revised Papers from the International Conference on Cryptography and Lattices
  • Year:
  • 2001

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Abstract

It has recently been proved by Nguyen and Shparlinski that the Digital Signature Algorithm (DSA) is insecure when a few consecutive bits of the random nonces k are known for a reasonably small number of DSA signatures. This result confirmed the efficiency of some heuristic lattice attacks designed and numerically verified by Howgrave-Graham and Smart. Here, we extend the attack to the Nyberg-Rueppel variants of DSA.We use a connection with the hidden number problem introduced by Boneh and Venkatesan and new bounds of exponential sums which might be of independent interest.