Thursday, August 16, 2007

Numbers and Spies

The August edition of Spycast is an interesting interview with Scott Carmichael, the Defence Intelligence Agency (DIA) counterintelligence official who investigated the Ana Belen Montes case. Montes, the senior Cuba analyst at the DIA, was arrested in 2001 and charged with committing espionage for Cuba. The federal prosecutors stated that she communicated with the Cuban Intelligence Service through encrypted messages and received her instructions through shortwave encrypted transmissions from Cuba. This case reminds me again at the famous numbers stations, and more specific at the Cuban "Attencion 1234567890". This case, just as the "Spy With No Name" case I wrote about last month, once again confirms that numbers stations are indeed spy stations. The messages on these numbers stations are believed to be encrypted with the absolutely secure one-time pad.

I recently uploaded Numbers v3.2, a small Crypto Secure Random Number Generator that generates pads with random numbers in various formats. It's available as freeware download on my One-time Pad page. Although using a CSPRNG theoretically never achieves Shannon's perfect secrecy, it will be useful in practice to generate one-time pads. Given the astronomical seed depth and period, it's infeasible to retrieve a CSPRNG numbers stream, and it will function in practice like a one-time pad. For those who are interested, the readme file in the install zip contains the VB source code of the generator algorithm.

1 comment:

Anonymous said...

TAPIR is a OTP program from NVA
in GDR
see
http://people.freenet.de/SASundChiffrierdienst/

under Freeware