Paul Reuvers, PE1BXL and Marc Simons, PE1RRT:
"New Discoveries in Enigma and Cipher Machine History", in English
Klaus Schmeh:
"Cryptological History" / "Die Geschichte der Cryptologie", in German and English
Dr. Simon Wiest:
“The Enigma R.D.E.”, in English and German
Klaus Kopacz, Paul Reuvers, John Alexander, Dr. Simon Wiest and Dan and Tom Perera:
“Demonstrations of Cipher Machines”, in German and English
Brief Summary:
There has always been a need for keeping communications secret. This forum will describe and demonstrate some of the historic machines and techniques that have been used to encipher and decipher messages and report on new discoveries in the history of cryptology.