Correcting errors in RSA private keys

  • Authors:
  • Wilko Henecka;Alexander May;Alexander Meurer

  • Affiliations:
  • Horst Görtz Institute for IT-Security, Ruhr-University Bochum, Faculty of Mathematics, Germany;Horst Görtz Institute for IT-Security, Ruhr-University Bochum, Faculty of Mathematics, Germany;Horst Görtz Institute for IT-Security, Ruhr-University Bochum, Faculty of Mathematics, Germany

  • Venue:
  • CRYPTO'10 Proceedings of the 30th annual conference on Advances in cryptology
  • Year:
  • 2010

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Abstract

Let pk = (N, e) be an RSA public key with corresponding secret key sk = (p, q, d, dp, dq, qp-1). Assume that we obtain partial error-free information of sk, e.g., assume that we obtain half of the most significant bits of p. Then there are well-known algorithms to recover the full secret key. As opposed to these algorithms that allow for correcting erasures of the key sk, we present for the first time a heuristic probabilistic algorithm that is capable of correcting errors in sk provided that e is small. That is, on input of a full but error-prone secret key sk we reconstruct the original sk by correcting the faults. More precisely, consider an error rate of δ ∈ [0, 1/2), where we flip each bit in sk with probability δ resulting in an erroneous key sk. Our Las-Vegas type algorithm allows to recover sk from sk in expected time polynomial in log N with success probability close to 1, provided that δ p, q) from an erroneous version with error rate δ