Tag Archives: Ft. Meade

NSA re-releases Boak’s Lectures

Boak's History of US COMSECI’m a fan of Boak’s Lectures – they cover the fundamentals of military cryptography just before the information revolution.David Boak developed the lectures for the National Security Agency’s Cryptologic School.

Even though the lectures are from the ’60s and ’70s, they remain relevant to today’s cybersecurity threats. Cryptographic techniques that were classified Secret in Boak’s work are prominent in modern commercial cryptosystems. A sanitized version of Boak’s Lectures (Vol 1, Vol 2) was released in 2008.

I’m happy to report that the Interagency Security Classification Appeals Panel has released a more complete (less redacted) version. It’s available from the Government Attic.

Continue reading NSA re-releases Boak’s Lectures

Boak’s Puzzle: Disposing of Classified Trash

Boak's History of US COMSECRecently I was skimming through the NSA’s “classified history of COMSEC” (Volume 1 and Volume 2).  This “history” is a transcription of lectures by David G. Boak, who liked to explain NSA-related topics from a historical perspective. He clearly inspired a generation of NSA’s employees. The last “real” page of the document contains a humorous story and a crypto puzzle (link to extract in pdf).

The NSA had an incinerator in their old Arlington Hall facility that was designed to reduce Top Secret crypto materials and such to ash. Someone discovered that it wasn’t in fact working. Contract disposal trucks had been disposing of this not-quite-sanitized rubish, and officers tracked down a huge pile in a field in Ft. Meyer.

How did they dispose of it? The answer is encrypted in the story’s text! Continue reading Boak’s Puzzle: Disposing of Classified Trash