IACR News item: 27 August 2014
Subhadeep Banik
ePrint ReportIn this paper we propose a dynamic cube attack on $105$ round Grain v1, that has a success probability of $100$\\%, and thus we report an improvement of $8$ rounds over the previous best attack on Grain v1 that attacks the entire Keyspace. We take the help of the tool $\\Delta${\\sf Grain}$_{\\sf KSA}$, proposed by Banik at ACISP 2014, to track the differential trails induced in the internal state of Grain v1 by any difference in the IV bits, and we prove that a suitably introduced difference in the IV leads to a distinguisher for the output bit produced in the $105^{th}$ round. This, in turn, helps determine the values of $6$ expressions in the Secret Key bits.
Additional news items may be found on the IACR news page.