Geoff Sullivan

Geoff Sullivan is a historian and cryptologist best known for his publications in these fields as well as simulation programs for historical cryptological machines.

Act

Geoff Sullivan deals with classical cryptology. He is particularly interested in the key rotor machines used in World War II . One example is the ENIGMA used in radio communications by the German Wehrmacht and its cryptanalysis .

Geoff Sullivan is a member of the Crypto Simulation Group (CSG) , which develops simulation programs for numerous historical encryption machines and makes them available for free download (see web links : Geoff's Crypto page ).

Works (selection)

• with David Hamer and Frode Weierud : Enigma Variations - An Extended Family of Machines . Cryptologia . Rose-Hulman Institute of Technology. Taylor & Francis, Philadelphia PA 22.1998.1 (July). ISSN  0161-1194 . PDF; 0.1 MB ( memento from September 1, 2007 in the Internet Archive )
• with Frode Weierud: The Swiss Nema Cipher Machine . Cryptologia, Vol XXIII (4), October 1999, pp. 310-328.
• with Frode Weierud: Breaking German Army Ciphers . Cryptologia, Vol XXIX (3), July 2005, pp. 193-232 PDF; 6.1 MB

Web links

• Homepage ( Memento from June 21, 2000 in the Internet Archive ) in the Internet Archive at archive.org, status: June 21, 2000 (English)
• Geoff's Crypto page (English)