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
Determining system for localization methods combination
Information-provision control method, information reproduction system, information-provision apparatus, information reproduction apparatus and information-presentation control program
Hand-held optical probe based imaging system with 3D tracking facilities
Para-xylylene based microfilm elution devices
Tunnel magnetoresistance read head with narrow shield-to-shield spacing
Semiconductor light-receiving device
Optoelectronic semiconductor chip comprising a reflective layer
  Randomly Featured Patents
Determining a payment strategy
Optical recording method and apparatus utilizing polymeric birefringent materials
Process and composition for color stabilized distillate fuel oils
Cool down temperature control system for clothes dryer
Precious metal recovery cartridge and method
Toilet tank mounted can caddy
Perhexiline for treating chronic heart failure
Method of tuning BAW resonators
Anchor plate assembly