Room 40

E143744

British codebreaking unit signals intelligence organization

Room 40 was the British Admiralty’s World War I codebreaking unit, famed for intercepting and decrypting German communications such as the Zimmermann Telegram.

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All labels observed (2)

Label	Occurrences
Room 40 canonical	3
Naval Intelligence Division, Room 40	1

Statements (47)

Predicate	Object
instanceOf	British codebreaking unit ⓘ signals intelligence organization ⓘ
activeDuring	World War I ⓘ
alsoKnownAs	40 O.B. ⓘ Room 40 ⓘ surface form: Naval Intelligence Division, Room 40
conflict	World War I ⓘ
contributedTo	Allied diplomatic strategy via decrypted messages ⓘ British naval victories through intelligence support ⓘ
country	United Kingdom ⓘ
dissolved	1919 ⓘ
employed	Alastair Denniston ⓘ Alfred Ewing ⓘ Dilly Knox ⓘ Frank Birch ⓘ Nigel de Grey ⓘ William Reginald Hall ⓘ various linguists and mathematicians ⓘ
fieldOfWork	codebreaking ⓘ cryptanalysis ⓘ signals intelligence ⓘ
inception	1914 ⓘ
influenced	development of modern signals intelligence ⓘ later British codebreaking at Bletchley Park ⓘ
languageOfWork	English ⓘ
location	Old Admiralty Building ⓘ surface form: Admiralty Old Building, London
notableAchievement	breaking German diplomatic ciphers ⓘ breaking German naval ciphers ⓘ interception and decryption of German naval communications ⓘ supporting Allied naval operations through intelligence ⓘ
notableEvent	Zimmermann Telegram decryption ⓘ The Zimmermann Telegram ⓘ surface form: Zimmermann Telegram interception
notableFor	pioneering large-scale codebreaking in wartime ⓘ secrecy of its operations ⓘ
notableWork	decryption of the Zimmermann Telegram ⓘ
operatedBy	Admiralty (United Kingdom) ⓘ surface form: British Admiralty
opponent	German Empire ⓘ
parentOrganization	British Naval Intelligence Division ⓘ surface form: Naval Intelligence Division
partOf	British Naval Intelligence Division ⓘ surface form: Admiralty Intelligence Division
primaryTarget	German diplomatic communications ⓘ Imperial German Navy communications ⓘ
reasonForInception	need to exploit intercepted German communications in World War I ⓘ
subsequentOrganization	Government Code and Cypher School ⓘ
typeOfBuildingSpace	office room in the Admiralty ⓘ
usedMethod	manual cryptanalysis ⓘ traffic analysis ⓘ
usedResource	captured German codebooks ⓘ intercepted radio traffic ⓘ

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

British intelligence → historicalPrecursor → Room 40 ⓘ

Government Code and Cypher School → predecessor → Room 40 ⓘ

Room 40 → alsoKnownAs → Room 40 ⓘ

this entity surface form: Naval Intelligence Division, Room 40

Dilly Knox → workLocation → Room 40 ⓘ