In this paper we study a 128-bit-key cipher called PC1 which is used as part of the DRM system of the Amazon Kindle e-book reader. This is the first academic cryptanalysis of this cipher and it shows that PC1 is a very weak stream cipher, and can be practically broken in a known-plaintext and even in a ciphertext-only scenario. A hash function based on this cipher has also been proposed and is implemented in the binary editor WinHex. We show that this hash function is also vulnerable to a practical attack, which can produce meaningful collisions or second pre-images. © 2013 Springer-Verlag Berlin Heidelberg.
CITATION STYLE
Biryukov, A., Leurent, G., & Roy, A. (2013). Cryptanalysis of the “kindle” cipher. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 7707 LNCS, pp. 86–103). https://doi.org/10.1007/978-3-642-35999-6_7
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