Cryptology ePrint Archive: Report 2012/701

Recovering RSA Secret Keys from Noisy Key Bits with Erasures and Errors

Noboru Kunihiro and Naoyuki Shinohara and Tetsuya Izu

Abstract: We discuss how to recover RSA secret keys from noisy key bits with erasures and errors. There are two known algorithms recovering original secret keys from noisy keys. At Crypto 2009, Heninger and Shacham proposed a method for the case where an erroneous version of secret keys contains only erasures. Subsequently, Henecka et al. proposed a method for an erroneous version containing only errors at Crypto2010. For physical attacks such as side-channel and cold boot attacks, we need to study key recovery from a noisy secret key containing both erasures and errors. In this paper, we propose a method to recover a secret key from such an erroneous version and analyze the condition for error and erasure rates so that our algorithm succeeds in finding the correct secret key in polynomial time. We also evaluate a theoretical bound to recover the secret key and discuss to what extent our algorithm achieves this bound.

Category / Keywords: public-key cryptography / RSA, cryptanalysis

Publication Info: This is the full version of PKC2013 paper.

Date: received 13 Dec 2012

Contact author: kunihiro at k u-tokyo ac jp

Available formats: PDF | BibTeX Citation

Version: 20121218:130252 (All versions of this report)

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