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William F. Friedman

1891–1969

1 series 1 book in order

William Frederick Friedman (1891–1969) was a US Army cryptologist who ran the research division of the Army's Signal Intelligence Service in the 1930s and parts of its follow-on services into the 1950s. In 1940, subordinates of his led by Frank Rowlett broke Japan's PURPLE cipher, disclosing Japanese diplomatic secrets before America's entrance into World War II.

Born
1891
Known for
A cryptographic series

Series by William F. Friedman

A cryptographic series

1 book in order

  1. Cover of The Index of Coincidence and Its Applications in Cryptanalysis (Cryptographic Series , No 49)

    The Index of Coincidence and Its Applications in Cryptanalysis (Cryptographic Series , No 49)

    Year unknown · William F. Friedman

    The Index of Coincidence and Its Applications in Cryptanalysis (Cryptographic Series , No 49) is a 1987 book by William F. Friedman. It is book 49 of…

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Frequently asked questions

How many books has William F. Friedman written?

We list 1 book by William F. Friedman across 1 series — each shown in full reading order.

What order should I read William F. Friedman's books?

Read each series in publication order. A good place to start is “The Index of Coincidence and Its Applications in Cryptanalysis (Cryptographic Series , No 49).” Open any series above for its complete numbered reading order.

Where can I buy William F. Friedman's books?

Every title links to Amazon from its series page — see our affiliate disclosure in the footer for how that supports the site.

Reading order compiled from author/publisher guidance and verified bibliographic data. Spotted a wrong order, a missing book, or any other mistake? and we'll correct it.

Some summaries adapted from Wikipedia, CC BY-SA 4.0.