The following is a summary of information so far received on German attempts to break into the British Typex machine, based on P/W interrogations carried out during and subsequent to the war. It is divided into (a) the North African interrogations, (b) information gathered after the end of the war, and (c) an attempt to sum up the evidence for and against the possibility of German successes.
Answers to GCCS questionnaire
7) What were the most common Allied addresses in the more secret BJ’s? Did American authorities appear frequently in the addresses?
On the whole I feel a thorough investigation would be a good thing but I don’t see who could do it.However it may be possible to shoot down the Wagner story after further discussion here and further interviews with POW’s .It is quite possible that Haunhorst was merely shown how the Typex machine worked and it would be interesting to know whether he actually saw an English message decoded.
Despite their efforts the Brits were not able to identify the mysterious ‘’Wagner’’ during the war or after.Their inquiries however concentrated on the Signal Intelligence Agency of the Army High Command - OKH/GdnA .After the war they interrogated Mettig who was in charge of the Army Agency from Nov '41 to Jun '43 :
Statements by PW Obstlt Mettig on Typex
So instead of resolving the Typex affair Mettig made things worse.Now the British had three people claiming Typex was read ,one of whom was the man in charge of the Army Signals Intelligence Agency.Further investigations singled out the top mathematicians of OKH/GdNA Doering and Pietsch plus Menzer of OKW/Chi:
I suspect that there is a third part for the Typex investigation.Unless it’s released questions will remain.A small piece of information regarding the efforts of OKH codebreakers versus Typex is available however from Ticom D-83 which based on captured documents says :