System for interfacing a digital encryption device to a time-div

Details System for interfacing a digital encryption device to a time-div System for interfacing a digital encryption device to a time-div

1988-05-20

1989-09-12

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 49, H04L 900

Patent

active

048667730

ABSTRACT:
A method and apparatus for interfacing a time division multiplexing (TDM) system to a data encryption device. A TDM data stream is processed prior to encryption to form a modified data stream having the TDM framing bits removed and the values of selected data bits forced to the value in a predetermined pattern. The data stream from the encryption device is treated as a source of data and transmitted as a second TDM data stream. The framing bits of the second TDM data stream are removed to recover the modified data stream which is then decrypted. The decrypted data stream is then processed to detect the predetermined pattern to reinsert TDM framing in their original locations in the data stream to form a modified TDM data stream essentially identical to the original TDM data stream.

REFERENCES:
patent: 4689606 (1987-08-01), Sato
patent: 4790013 (1988-12-01), Kage
patent: 4792949 (1988-12-01), Virdee et al.
patent: 4803726 (1989-02-01), Levine et al.

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