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gptkbp:instanceOf
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crypt
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gptkbp:alsoKnownAs
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gptkb:ECM_Mark_II
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gptkbp:category
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cryptographic device
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gptkbp:countryOfOrigin
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gptkb:United_States
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gptkbp:declassified
|
2001
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gptkbp:developedBy
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gptkb:U.S._Navy
gptkb:U.S._Army_Signal_Corps
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gptkbp:displayedAt
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gptkb:National_Museum_of_the_United_States_Air_Force
gptkb:National_Cryptologic_Museum
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gptkbp:encryptionStrength
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very strong for its era
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gptkbp:features
|
high
complex rotor stepping
no plugboard
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|
https://www.w3.org/2000/01/rdf-schema#label
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SIGABA cipher machine
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gptkbp:introduced
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late 1930s
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gptkbp:inventedBy
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gptkb:Laurance_Safford
gptkb:William_F._Friedman
gptkb:Frank_Rowlett
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gptkbp:language
|
English
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gptkbp:mechanismOfAction
|
irregular rotor stepping
uses 15 rotors in three banks
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gptkbp:notableFor
|
never known to be broken by enemy cryptanalysts
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gptkbp:notableUser
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gptkb:Dwight_D._Eisenhower
gptkb:George_S._Patton
gptkb:U.S._Joint_Chiefs_of_Staff
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gptkbp:numberOfEngines
|
15
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gptkbp:operatedBy
|
gptkb:U.S._Air_Force
gptkb:U.S._Army
gptkb:U.S._Navy
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gptkbp:patent
|
gptkb:U.S._Patent_2,972,726
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gptkbp:powerSource
|
electric
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gptkbp:predecessor
|
gptkb:M-134-C_cipher_machine
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gptkbp:relatedTo
|
gptkb:Enigma_machine
gptkb:Typex_machine
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gptkbp:replacedBy
|
gptkb:KL-7_cipher_machine
gptkb:M-134-C_cipher_machine
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gptkbp:status
|
obsolete
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gptkbp:successor
|
gptkb:KL-7_cipher_machine
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gptkbp:supportsAlgorithm
|
electromechanical rotor cipher
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gptkbp:survivesIn
|
rare
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gptkbp:totalProduced
|
about 10,000 units
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gptkbp:usedBy
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gptkb:Allied_forces
gptkb:United_States
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gptkbp:usedDuring
|
gptkb:World_War_II
early Cold War
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gptkbp:usedFor
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strategic communications
high-level military traffic
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gptkbp:weight
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about 100 pounds
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gptkbp:bfsParent
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gptkb:NSA_Crypto_Museum
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gptkbp:bfsLayer
|
5
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