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Revisiting Security Claims of XLS and COPA
XLS COPA Pseudorandom function
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2015/12/30
Ristenpart and Rogaway proposed XLS in 2007 which is a generic method to encrypt messages with incomplete last blocks. Later Andreeva et al., in 2013 proposed an authenticated encryption COPA which us...
XLS is not a Strong Pseudorandom Permutation
XLS SPRP Distinguishing Advantage
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2015/12/30
In FSE 2007, Ristenpart and Rogaway had described a generic
method XLS to construct a length-preserving strong pseudorandom permutation
(SPRP) over bit-strings of size at least n. It requires a leng...