Security News > 2021 > January > Military Cryptanalytics, Part III

The NSA has just declassified and released a redacted version of Military Cryptanalytics, Part III, by Lambros D. Callimahos, October 1977.

Parts I and II, by Lambros D. Callimahos and William F. Friedman, were released decades ago - I believe repeatedly, in increasingly unredacted form - and published by the late Wayne Griswold Barker's Agean Park Press.

Like Parts I and II, Part III is primarily concerned with pre-computer ciphers.

This text constitutes the third of six basic texts on the science of cryptanalytics.

The first two texts together have covered most of the necessary fundamentals of cryptanalytics; this and the remaining three texts will be devoted to more specialized and more advanced aspects of the science.

EDITED TO ADD: I have been informed by a reliable source that Parts 4 through 6 were never completed.

News URL

https://www.schneier.com/blog/archives/2021/01/military-cryptanalytics-part-iii.html