Welcome to the resource topic for 2017/647
Title:
A TMDTO Attack Against Lizard
Authors: Subhamoy Maitra, Nishant Sinha, Akhilesh Siddhanti, Ravi Anand, Sugata Gangopadhyay
Abstract: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. This helps us in mounting a TMDTO attack with preprocessing complexity 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}.
ePrint: https://eprint.iacr.org/2017/647
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