Cryptography – Key management – Having particular key generator
Patent
1985-04-18
1988-08-09
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 43, 380 44, H04L 900
Patent
active
047633573
ABSTRACT:
A method and apparatus for providing secure electronic communications over a communications medium between first and second locations is disclosed. A data device for generating and/or receiving data is located at each of the locations. A composite modem is coupled to each data device. Each composite modem comprises a microprocessor controller operating under program control for determining the configuration of the message to be transmitted from one data device to the other. The controller is coupled to a switching circuit which selects, in dependence on a configuration message generated by the controller, the configuration of the message to be transmitted. A plurality of characteristic controllers are coupled to the switching circuit. Each characteristic controller is provided to select at least one variation of one of a plurality of characteristics of the message, including the baud rate, transmission coding scheme, transmission method, parity technique, transmission technique (full or half duplex), carrier frequency and modulation technique. The configuration message is also transmitted to the second location so that the second location can be properly configured to receive the message. At time intervals, preferably random time intervals, the configuration message is changed. The configuration message itself is also preferably generated randomly. The configuration message can be changed as often as necessary to prevent unauthorized access to the information transmitted over the communications channel.
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Cangialosi Salvatore
Lewis Aaron J.
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