Elsevier

Information Processing Letters

Volume 109, Issue 2, 31 December 2008, Pages 121-123
Information Processing Letters

A general mixing strategy for the ECB-Mix-ECB mode of operation

https://doi.org/10.1016/j.ipl.2008.09.012Get rights and content

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 F2n 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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