From the archives
During the winter of 1999-2000 I was granted special access to the archives of the Swedish signal intelligence organization, FRA
(Försvarets Radioanstalt, or National Defence Radio Establishment). The documents presented here are an assortment
of a plethora of cryptographic WWII material held in the FRA archives, which have had the secrecy lifted on my request.
The material studied by me consists mainly of codes used by Soviet forces, but I've also looked at some German codes.
All German material has had the secrecy lifted, but some of the Soviet material is still considered too sensitive after more than
56 years, but the released stuff is more than enough.
Soviet material
2-figure systems.
3-figure systems.
4-figure systems.
5-figure systems.
Call sign encryption system
Information provided to me from Finland, explains a system used by the Soviet Ground Forces
in WWII to encrypt their call signs. The system was reconstructed by
RTK the Finnish Sigint organisation at the time.
German material
© Torbjörn Andersson.
Torbjörn Andersson Fecit