[Spooks] Cuban numbers & Playfair cipher

[Nicholas Gessler]

Thanks to those of you who have helped with insights into the
tradecraft of Cuban numbers stations.

I just came across a
Playfair cipher used by Ana Belen Montes posted by the FBI
and have posted it with some analytical comments:
http://www.duke.edu/web/isis/gessler/collections/crypto-cuban-numbers.htm

If I am correct about the method of its use, I am quite surprised at the
lack of security of this method of communication...  It was in use some time
before September 21, 2001 and so I am wondering if anyone has extensive
recordings from that period for which this table might be the key?

I have requested more images of tradecraft items and will post what I get
as I receive them.

My apologies for cross-posting and my gratitude to those who have
emailed me with ideas and data.

Nick
nick.gessler at duke.edu