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US 4,790,012 AGranted
Encryption-decryption system
AssigneeGeneral Electric Company
InventorEldon M. Sutphin, Jr.
Life of this patent
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AssigneeGeneral Electric Company
InventorEldon M. Sutphin, Jr.
Estimating the term…
In a data encrypting/decrypting system both the encoding and decoding stations are receptive of a common source of time varying digital signals. The digital signals in the encoding station are applied to one or both of circuits for encrypting data supplied to the encoding station and spreading the spectrum of a carrier which is modulated by the encrypted data. The digital signals in the decoding station are applied to one or both of circuits for despreading the carrier transmitted by the encoding station and decrypting the received encrypted data. In the decoding station and optionally in the encoding station delays are interposed between the circuits therein and the reception point of the digital signals of values such that the digital signals arrive at the decoding station circuit(s) in synchronism with when data encoded in accordance with a particular digital signal arrives at the decoding station.
An encryption/decryption system for receiving and utilizing code modifying signals from an independent signal source station wherein said signal source station is the sole source of code modifying signals for encryption and decryption and which comprises means for transmitting a carrier modulated in accordance with digital code modifying signals which vary with time, said system further comprising, in combination:
A method for encrypting and decrypting data at geographically separated encoding and decoding stations, comprising:
Dependencies are inferred from the claim text.