Riverbank Publications
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The Riverbank Publications is a series of pamphlets written by the people who worked for millionaire George Fabyan in the multi-discipline research facility he built in the early 20th century near Chicago. They were published by Fabyan, often without author credit. The publications on cryptanalysis,[1] mostly written by William Friedman, with contributions from Elizebeth Smith Friedman and others, are considered seminal in the field.[2] In particular, Publication 22 introduced the Index of Coincidence, a powerful statistical tool for cryptanalysis.
