The Typex Files

Introduction

The Typex files are documents from the US Naval cryptanalytical organisation OP-20-G's study of the British cipher machine Typex. At the end of the war, OP-20-G got access to one of these machines that were used operationally by the British Navy in the Atlantic Ocean area. At the same time, they also had access to the operational rotor sets used with this machine, SP02390, SP02391 and Y269. The documents contain the rotor wirings, photos of a Typex Mark II, serial No. 2026, and other technical details such as circuit diagrams, movement patterns, indicators etc.

Typex Documents

• Two OP-20-G Reports, "Request for M8 and M9 Wheels" and "Studies of R5W Enigma" by Lt. R. E. Greenwood, 28 February 1945
• OP-20-G Report "Description of R5W Enigma Machine" by Ens. G. F. Smith, 5 March 1945
• OP-20-G Report "Technical Features of R5W Enigma Machine" by Ens. G. F. Smith, 5 March 1945
• US Report 83-669557, "Cryptographic Description Type X Machine"
• Hagelin-Cryptos Report, "Cryptographic Data Sheet Typex Mark 22 (Short title — BID/08/2)"

Copyright:

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The material described on these pages is created, collected, edited and published
by Frode Weierud, © February 2023

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