Appendix F
Step One: copy the numbers in the CIA message onto a large pad of graph paper, leaving approximately one inch betweens lines.
Step Two: Copy the numbers from the TRIGON one-time pad beneath each digit.
Step Three: Subtract the OTP from the “message” using “non-carrying” math.
Step Four: Separate the deciphered message into two digit numbers and convert into letters; A-Z are numbered 01 to 26 (A=01, B=02, C=03, D=04, etc.). An X (24) is used to separate sentences. The message begins:
Author’s Note: For operational use (but not in the example presented here) the first five-digit group at the top of the left-hand column was designated the “indicator group.” The first five-digit group received in the OWVL transmission identified the correct page of the agent’s OTP for encryption. After one-time use, the entire page would be destroyed by the agent to protect forever the security of the encrypted communication.