SIGSALY

999	FHSS
259	frequency
255	1943
254	secret
254	speech
248	encryption
242	keying
235	modulation
234	method
232	28TH

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cryptographic pseudorandom decryption equipment transmitting VFO Tafaraoui signals Icom JANUARY encrypted 1942 existence voice receiving vocoder records computer digital modulated Venona predistribution intelligence LSSA encrypting cryptography waveform MARCH VENONA receivers analog Alan pseudorandomly wideband techniques spread communications messages computing

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