IACR News item: 25 November 2013
Nasser Ramazani Darmian
ePrint Report
Rabbit stream cipher is one of the finalists of eSTREAM
project which uses 128-bit secret keys. Prior to us, the attacks on Rabbit
has been all focused on the bias analysis and the best result showed the
distinguishing attack with complexity 2136. Our analysis in this paper,
is based on chosen IV analysis on reduced N-S round of Rabbit though
using multi cube tester. For this purpose we show for a mature cube
we could easily identify weak subcubes which increase the probability of
distinguishing for an unknown secret key. We also represent with 225
complexity, using one iteration of next state function the keystream is
completely distinguishable from random.
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