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A TMDTO Attack Against Lizard
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DOI：10.1109/TC.2017.2773062.png)
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摘要
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Lizard is a very recently proposed lightweight stream cipher that claims 60 bit security against distinguishing ( related to state recovery) and 80 bit security against key recovery attack. This cipher has 121 bit state size. In this paper, we first note that using psi key stream bits one can recover psi unknown bits of the state when tau state bits are fixed to a specific pattern. This is made possible by guessing the remaining state bits. We present certain values of psi; tau based on the state size that helps in mounting a generic conditional TMDTO attack following the BSW sampling. For Lizard, we obtain the preprocessing complexity as 2(67), and the maximum of Data, Time and Memory complexity during the online phase as 2(54). The parameters in the online phase are significantly less than 2(60).
Keyword:
Cryptanalysis
Lizard
lightweight stream cipher
time memory data trade-off (TMDTO) attack
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