NSA encryption systems
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What links here
SIGSALY
World War II cryptography
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STU-III
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Project X
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Digital recording
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Bombe
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Military citadels under London
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Selfridges
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Index of cryptography articles
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Green Hornet (disambiguation)
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Frequency-hopping spread spectrum
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Spread spectrum
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Scrambler
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Hotline
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Eye pattern
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Companding
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Vocoder
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Single-sideband modulation
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One-time pad
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Bell Labs
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Alan Turing
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