Search Result

Srl

Item

ID: 124574

Tunny reveals B-Dienst successes against the Convoy Code / Erskine, Ralph

Erskine, Ralph	Journal Article
	0 Rating(s) & 0 Review(s)

Publication

2013.

Summary/Abstract

During World War II, German naval codebreakers in the B-Dienst made extensive breaks into Naval Cypher No. 3, an enciphered code used by the Allies for the vital Atlantic convoys. It is often suggested that they did not discover that Cypher No. 3 was insecure until May 1943. This article shows that the British had learned about this much earlier, in August 1942, and that they informed the US Navy then. British solutions of messages encrypted with the Wehrmacht's Tunny teleprinter cipher machine had revealed that the B-Dienst was solving Naval Cyphers Nos. 3 and 4. Surprisingly, those ciphers were not replaced until June 1943.

Key Words

Britain ; US Navy ; B - Dienst ; Codebreakers ; Convoy Code ; World War II

Links

'Full Text'

In Basket

Export

ID: 079223

William Friedman's Bletchley park diary: a different view / Erskine, Ralph

Erskine, Ralph	Journal Article
	0 Rating(s) & 0 Review(s)

Publication

2007.

Summary/Abstract

'William Friedman's Bletchley Park Diary' (INS 20/4 (2005) pp. 654-69) stated that Friedman, with Col. Alfred McCormack and Lt.-Col. Telford Taylor (US Army Special Branch), visited Bletchley Park in mid-1943 to negotiate with the British Government Code and Cypher School on how the Travis-Strong Agreement of May 1943 on Sigint cooperation should be implemented. This article shows that they had no substantive negotiating powers, and that they were essentially on a fact-finding mission.

Key Words

Intelligence ; United States

In Basket

Export