Accession Number : ADD008448

Title :   Five V Insertion Unit.

Descriptive Note : Patent,


Personal Author(s) : Cory,William E ; Cunningham,Allen B

Report Date : 14 Apr 1981

Pagination or Media Count : 14

Abstract : This patent is considered for use with a cryptographic teletype transmission system having a relay for transferring teletype characters to an encyphering transmitter, a decyphering receiver and a teletype printer, a security system comprising a generator for producing an auxiliary teletype character, circuit means responsive to the failure of transfer of a valid teletype character to said transmitter to activate said generator to supply an auxiliary character to said transmitter, a clamp circuit responsive to activation of said generator to inhibit transfer of a valid character to said transmitter until said auxiliary character has been completed, a transfer system for transferring they decyphered characters from the receiver to the printer, storage means for storing a plurality of successive teletype characters, a recognition circuit responsive to the presence of said auxiliary teletype character in said storage means for inhibiting printing of said auxiliary teletype character.

Descriptors :   *Patents, *Cryptography, *Coders, *Teletype systems, Secure communications, Pulse generators, Control, Waveforms, Circuit analysis, Mixers(Electronics), Message processing

Subject Categories : Cybernetics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE