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gptkbp:instance_of
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gptkb:crypt
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gptkbp:associated_with
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gptkb:crypt
gptkb:military_intelligence
gptkb:US_intelligence
gptkb:Marian_Rejewski
gptkb:naval_warfare
gptkb:Bletchley_Park
gptkb:Nazi_Germany
gptkb:Alan_Turing
gptkb:British_intelligence
gptkb:military_history
gptkb:military_strategy
gptkb:SIGINT
gptkb:historical_significance
gptkb:intelligence_gathering
gptkb:historical_analysis
gptkb:Polish_Cipher_Bureau
data encryption
combat operations
tactical operations
signal intelligence
codebreaking efforts
information security
World War II espionage
military communications
strategic operations
cryptographic security
air warfare
warfare tactics
ground warfare
war studies
operational security
cryptographic history
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gptkbp:code
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Schlüsselgerät
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gptkbp:decryption_efforts
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gptkb:Bletchley_Park
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gptkbp:designed_by
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gptkb:Arthur_Scherbius
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gptkbp:diameter
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gptkb:4
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gptkbp:dimensions
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350 mm x 300 mm x 150 mm
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gptkbp:features
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plugboard
four rotors
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gptkbp:first_appearance
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Allied cryptanalysts
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gptkbp:first_introduced
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gptkb:1940
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gptkbp:historical_event
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gptkb:Battle_of_the_Atlantic
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gptkbp:historical_significance
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gptkb:World_War_II
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https://www.w3.org/2000/01/rdf-schema#label
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Enigma M4
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gptkbp:influenced_by
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gptkb:Enigma_I
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gptkbp:input_output
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gptkb:keyboard
light bulbs
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gptkbp:legacy
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modern cryptography
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gptkbp:notable_feature
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gptkb:Reflector
cipher wheel
variable rotor positions
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gptkbp:notable_users
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U-boat commanders
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gptkbp:number_of_plugboard_connections
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gptkb:10
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gptkbp:operates_in
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1945
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gptkbp:production_years
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gptkb:1940
1945
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gptkbp:related_to
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gptkb:crypt
gptkb:intelligence_operations
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gptkbp:replaced_by
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more advanced cipher machines
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gptkbp:rotor_types
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I, II, III, IV
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gptkbp:security
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substitution cipher
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gptkbp:successor
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gptkb:Enigma_M3
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gptkbp:used_by
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German military
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gptkbp:used_in
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gptkb:military_operations
naval communications
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gptkbp:weight
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12 kg
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gptkbp:bfsParent
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gptkb:The_Enigma
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gptkbp:bfsLayer
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4
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