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The Secret History of the CIA's Spytechs from Communism to Al-Qaeda
Robert Wallace and H. Keith Melton
with Henry R. Schlesinger
"A fascinating study of CIA espionage operations." —Jeffrey T. Richelson,
author of The Wizards of Langley: Inside the CIA's Directorate of Science
and Technology
Appendix F
instructions to decipher the official messege from the CIA
Page 451
For her covcom, Montes had been instructed to purchase a Toshiba 405CS laptop
computer and was provided by her Cuban handler assigned to the Cuban Mission
at the United Nations, with two diskettes, S-1 and R-1
Page 452
for encrypting and decrypting messeges. Because the possession of high-level
encryption software would be alerting if Montes´s laptop computer was examined
forensically, digital encryption program (PGP or similar) and one-time keys were
embedded on each diskette.
When receiving messeges transmitted to her Sony shortwave radio by her service,
she world copy and enter the ciphertext numbers into her laptop computer and
inser diskette R-1 to recover the plaintext...
*The one-way voice link described a covert communications system that transmitted
messages to an agent's unmodified shortwave radio using the high-frequency shortwave
bands between 3 and 30 MHz at a predetermined time, date, and frequency contained
in their communications plan. The transmissions were contained in a series of repeated
random number sequences and could only be deciphered using the agent's one-time pad.
If proper tradecraft was practiced and instructions were precisely followed, an OWVL
transmission was considered unbreakable. [...] As long as the agent's cover could justify
possessing a shortwave radio and he was not under technical surveillance, high-frequency
OWVL was a secure and preferred system for the CIA during the Cold War.
Wikipedia reference
Acronym Definition
OWVL One Way Voice Link
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