Resources Contact Us Home
Secure teleconferencing system

Image Number 4 for United States Patent #4845749.

A secure audio teleconferencing system is disclosed. The secure teleconferencing system comprises a centralized facility or bridge to which a plurality of participants is connected. The role of the bridge is to receive encrypted message signals from the participants and to add the encrypted message signals, modulo some known number. The result is then transmitted to the participants. Each participant is able to decrypt the modular sum of encrypted message signals, to obtain the desired ordinary sum of clear text message signals. In accordance with the invention, the message signals remain encrypted throughtout processing by the bridge. There are no non-encrypted messages.

  Recently Added Patents
High-density 3-dimensional structure
Call admission control method and system
Touch screen guitar
Method for etched cavity devices
Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation
Portable electronic device holder and tether
Systems and methods for unchoked control of gas turbine fuel gas control valves
  Randomly Featured Patents
Multichannel interface
Assist handle spring design for constant return velocity
Protective eyeglasses
Chuck for bit
Trench photodetector
Arrangement for the pressure atomization of liquid fuel and process for the same
Semicondutor device having ferroelectric capacitor and hydrogen barrier film and manufacturing method thereof
Interlocking wooden mat roadway
Gutter insert