Variably Modified Permutation Composition: Difference between revisions

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'''VMPC''' ('''Variably Modified Permutation Composition''') is a [[stream cipher]] similar to the

well known and popular cipher [[RC4]] designed by [[Ron Rivest]]. It was designed by Bartosz ZoltakŻółtak, presented in 2004 at the [[Fast Software Encryption]] conference. VMPC is a modification of the [[RC4]] cipher.<ref name=maximov>{{cite document |title=Two Linear Distinguishing Attacks on VMPC and RC4A and Weakness of RC4 Family of Stream Ciphers (Corrected) |author=Alexander Maximov |date=2007-02-22 |url=https://eprint.iacr.org/2007/070 }} (originally presented at FSE 2006 confernece)</ref>

The core of the cipher is the VMPC function, a transformation of ''n''-element [[permutation]]s defined as: