Signal scrambler-unscrambler for binary coded transmission syste
Signaling system
Signaling system
Signaling system
Signed document transmission system
Simple and effective public-key cryptosystem
Simultaneous transmission of an analog message signal and a digi
Small compact cathode ray oscilloscope assembly
Small packet communication network
Software cryptographic apparatus and method
Software protection device
Software protection methods and apparatus
Software protection system
Software security method using partial fabrication of proprietar
Solid state key for controlling access to computer software
Solid state key for controlling access to computer software
Space diversity system in PCM-TDMA telecommunication system usin
Squelch circuit for a digital system
Start and stop system
Start/stop teleprinter scrambler