Some Results on Related Key-IV Pairs of Espresso

ePrint Report: Some Results on Related Key-IV Pairs of Espresso

George Teseleanu

In this paper, we analyze the Espresso cipher from a related key chosen IV perspective. More precisely, we explain how one can obtain Key-IV pairs such that Espresso's keystreams either have certain identical bits or are shifted versions of each other. For the first case, we show how to obtain such pairs after $2^{32}$ iterations, while for the second case, we present an algorithm that produces such pairs …

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