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- W1599058895 abstract "Almost all the existing stream ciphers are using two inputs: a secret key and an initial value (IV). However recent attacks indicate that designing a secure IV-dependent stream cipher and especially the key and IV setup component of such a cipher remains a difficult task. In this paper we first formally establish the security of a well known generic construction for deriving an IV-dependent stream cipher, namely the composition of a key and IV setup pseudo-random function (PRF) with a keystream generation pseudo-random number generator (PRNG). We then present a tree-based construction allowing to derive a IV-dependent stream cipher from a PRNG for a moderate cost that can be viewed as a subcase of the former generic construction. Finally we show that the recently proposed stream cipher quad [3] uses this tree-based construction and that consequently the security proof for quad's keystream generation part given in [3] can be extended to incorporate the key and IV setup." @default.
- W1599058895 created "2016-06-24" @default.
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- W1599058895 date "2007-08-17" @default.
- W1599058895 modified "2023-10-16" @default.
- W1599058895 title "On the Security of IV Dependent Stream Ciphers" @default.
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- W1599058895 doi "https://doi.org/10.1007/978-3-540-74619-5_17" @default.
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