Declassified Cold War code-breaking manual has lessons for solving 'impossible' puzzles
- Written by Richard Bean, Research Fellow, The University of Queensland
NSAThe United States National Security Agency — the country’s premier signals intelligence organisation — recently declassified a Cold War-era document about code-breaking.
The 1977 book, written by cryptologist Lambros Callimahos, is the last in a trilogy called Military Cryptanalytics. It’s significant in the history of...





