Patents in the field of Speech Encryption

• Digital speech encryption using encryption memory

• Method of speech encryption by time scrambling

• Speech and control message encryption in cellular radio.

• Method and device for speech encryption and decryption in voice transmission

• Digital Encryption Speech System using analog Telephone Line

• Method for speech encryption with simultaneous data transmission in narrow band transmission system

• Mobile or cordless phone with device for encrypting or decrypting speech and data, can store and transmit encryption keys via short range link