Claims
- 1. A digital cipher system for use with a teleprinter operable in the half-duplex mode and having a keyboard and a printer interconnected with a two wire transmission system comprising:
- means for connecting the keyboard and printer of the teleprinter in series,
- keyboard receiving means for receiving keyboard digital data from the keyboard,
- means for enciphering said keyboard digital data,
- means for transmitting the keyboard enciphered digital data on the transmission system,
- printer inhibit means for suppressing the operation of said printer during the operation of the keyboard in order to prevent the data being transmitted on the transmission system from being reflected back and printed by said printer,
- data receiving means for receiving externally transmitted enciphered digital data from the transmission system;
- means for deciphering the received enciphered digital data,
- means for directing the deciphered digital data to the printer for printing, and
- keyboard inhibit means for suppressing the operation of said keyboard during the operation of the printer.
Parent Case Info
This is a division of application Ser. No. 568,096 filed Apr. 14, 1975.
US Referenced Citations (4)
Divisions (1)
|
Number |
Date |
Country |
Parent |
568096 |
Apr 1975 |
|