Abstract
EME is an important mode of operation of a block cipher. It converts an n-bit block cipher into a strong pseudo-random permutation which works on longer length strings. In this short note, we generalize the mixing layer of EME. The generalization is done using a linear map ψ from F 2 n to itself, where n is the block size of the underlying block cipher. A possible instantiation of ψ is using word oriented LFSRs. For n = 128 , this implementation of ψ results in the mixing layer being processed about twice as fast as that in the original EME mode of operation.
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