Variably Modified Permutation Composition: Difference between revisions

Revision as of 09:16, 23 July 2020

Revision as of 10:11, 25 July 2020

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The VMPC function is used in an [[encryption]] algorithm – the VMPC [[stream cipher]]. The algorithm allows for efficient in software implementations; to encrypt {{mono|L}} bytes of plaintext do:

<sourcesyntaxhighlight lang="text" line>

n = 0

Repeat steps 3-8 L times:

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P[s] = Temp #Swap(P[n], P[s])

n = (n + 1) mod 256

</syntaxhighlight>

</source>

Where 256-element permutation {{mono|P}} and integer value {{mono|s}} are obtained from the encryption password using the VMPC-KSA (Key Scheduling Algorithm).