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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Cryptanalysis of the “Kindle” Cipher
verfasst von : Alex Biryukov, Gaëtan Leurent, Arnab Roy
Erschienen in: Selected Areas in Cryptography
Verlag: Springer Berlin Heidelberg
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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.