Telegraphy – Systems – Printing
Patent
1981-07-23
1984-02-28
Cangialosi, Sal
Telegraphy
Systems
Printing
178 2214, 178 2217, 455 26, 455 30, H04L 900
Patent
active
044343221
ABSTRACT:
A scrambler/encryption system for randomizing an information-containing data signal for transmission and for reproducing at the receiver the information-containing data signal. The information-containing data to be transmitted is applied to a modulo-two adder, the output of which is the encoded data for transmission and which is also an input of an n stage shift register. An arbitrary logic network, having a plurality of inputs each connected to a plurality of selected shift register stages, produces a particular key signal responsive to the condition of the contents of the selected shift register stages. At the receiver, the received randomized data is fed simultaneously to the input of an n stage shift register and to an input of a modulo-two adder. An identical arbitrary logic network is connected to the receiver shift register and produces the same particular key signal responsive to the same conditions in the shift register. The modulo-two adder in the receiver has as its second input the key signal. Embodiments also show the use of the scrambler/encryption circuitry in other applications, i.e., rendering tamperproof recorded information, e.g., audio recording, and checking the operation of high speed shift registers.
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Cangialosi Sal
Racal Data Communications Inc.
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