Method and apparatus for protecting computer software utilizing

Method and apparatus for protecting stored and transmitted data

Method and apparatus for regenerating a modified duobinary signa

Method and apparatus for representing characters

Method and apparatus for securing data transmissions

Method and apparatus for securing data transmissions

Method and apparatus for securing data transmissions

Method and apparatus for securing data transmissions

Method and apparatus for synchronizing the ciphering and deciphe

Method and apparatus for synchronously detecting a differentiall

Method and apparatus for the synchronization of a deciphering de

Method and apparatus for the two-way transmission of pulses

Method and apparatus for transaction and identity verification

Method and apparatus for use in public-key data encryption syste

Method and apparatus incorporating a one-way sequence for transa

Method and apparatus providing registered mail features in an el

Method and circuit for generation of digitally frequency-shiftab

Method and device for radio transmission of binary data signals

Method and device for receiving an interface signal

Method and device for the coded transmission of messages