Method and apparatus for the modulation and demodulation of...

Method and apparatus for the reliable authentication of...

Method and apparatus for the scrambled transmission of...

Method and apparatus for the secret transmission of speech...

Method and apparatus for transceiving cryptographically...

Method and apparatus for transmitting and receiving a...

Method and apparatus for transmitting and receiving...

Method and apparatus to maintain encryption synchronization...

Method and device for coding and/or decoding and securing data

Method and device for transmitting informations between...

Method and installation for masked speech transmission over...

Method and system for enciphering and deciphering...

Method and system for processing electronic documents

Method and system for the mutual encyphered identification...

Method for coded data transmission in half-duplex operation...

Method for compensating for capacity overload in a spread...

Method for cryptographic transmission of speech signals and...

Method for embedding information in modem handshake...

Method for improving message reception from multiple sources

Method for interchanging n partial bands