International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 19 April 2015

Santanu Sarkar
ePrint Report ePrint Report
In Asiacrypt 2010, Knellwolf, Meier and Naya-Plasencia proposed

distinguishing attacks on Grain v1 when (i) Key Scheduling process is

reduced to 97 rounds using $2^{27}$ chosen IVs and (ii) Key Scheduling process is

reduced to 104 rounds using $2^{35}$ chosen IVs. Using similar idea, Banik

obtained a new distinguisher for 105 rounds.

In this paper, we show similar approach can work for 106 rounds. We present

a new distinguisher on Grain v1 for 106 rounds with success probability 63\\%.

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