Armed Forces Security Agency Machine. The predecessor of NSA, the Armed Forces Security Agency (AFSA), was established within the Department of Defense, under the command of the Joint Chiefs of Staff, [..]

Automatic Secure Voice Communications. A former worldwide secure voice network used by the US Government.. The last SECORD/AUTOSEVOCOM Secure voice switch in the world was deactivated at the Pentagon [..]

  BI is Bravo India.  When operators were instructed to"go BI" , they would bring up the next keyset for a specific crypto device.

  A system for replacing words, phrases, letters or numbers by other words or groups of letters or numbers for concealment or brevity.

One of a family of devices developed to read in, transfer, or store key. KYK-l3 Electronic Transfer Device, KYX-l5 Net Control Device, and KOI-l8 General Purpose Tape Reader are examples of common fil [..]

  (Computer Security). The NSA's program for protecting U.S. government computers from exploitation and intrusion by foreign intelligence services and computer cracking and hacking groups.

Contiguous US.

Marking or designator identifying COMSEC keying material used to secure or authenticate telecommunication carrying classified or sensitive U.S. Government or U.S. Government derived information. When [..]

The science and art of making and breaking codes and ciphers.

Convert enciphered text to the equivalent plain text by means of a cipher system.