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US 4,185,166 AGranted
Multi-mode digital enciphering system
AssigneeDatotek, Inc.
InventorsFrederick A. Kinch, Jr., Barrie O. Morgan
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AssigneeDatotek, Inc.
InventorsFrederick A. Kinch, Jr., Barrie O. Morgan
Estimating the term…
The specification discloses an electronic digital enciphering system which is selectively operable in a plurality of different modes. The system may be operated in an off-line mode for preparing enciphered message tapes prior to transmission via teleprinter message circuits. The system may also be operated in an on-line asynchronous mode wherein a sending station may asynchronously transmit enciphered data on-line to a remote receiving unit, synchronization being provided by the start/stop pulses of the individual digital characters. The system may also be operated in an on-line synchronous mode wherein a sending and a receiving unit are automatically synchronized in time by local self-contained clocks in order to bridge fades or interference in a transmission medium such as radio telegraph, or the like. The system may be utilized on either half-duplex or full-duplex communication channels.
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:
Dependencies are inferred from the claim text.