Errors Matter: Breaking RSA-Based PIN Encryption with Thirty Ciphertext Validity Queries
- Cite this paper as:
- Smart N.P. (2010) Errors Matter: Breaking RSA-Based PIN Encryption with Thirty Ciphertext Validity Queries. In: Pieprzyk J. (eds) Topics in Cryptology - CT-RSA 2010. CT-RSA 2010. Lecture Notes in Computer Science, vol 5985. Springer, Berlin, Heidelberg
We show that one can recover the PIN from a standardized RSA-based PIN encryption algorithm from a small number of queries to a ciphertext validity checking oracle. The validity checking oracle required is rather special and we discuss whether such oracles could be obtained in the real world. Our method works using a minor extension to the ideas of Bleichenbacher and Manger, in particular we obtain information from negative, as well as positive, responses from the validity checking oracle.
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