VMs: Repetative sequence generation

["Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>]

This:

When a long running key is used for Vigenere encryption, but that key is
re-used, Kerchoffs superimposition can be used to align different messages
encrypted with the same key. The messages are slid against each other, and
positions that provide a high number of coincidences, particularly those
involving groups of consecutive characters, are chosen

Found here http://home.ecn.ab.ca/~jsavard/crypto/pp0104.htm

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