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
Cell transport system comprising a homogeneous mixture of agarose and agarase
System and method for content delivery
Epitaxial substrate for electronic device, in which current flows in lateral direction and method of producing the same
Dynamic trunk distribution on egress
Programming of DIMM termination resistance values
Vibration disturbance estimation and control
Location estimation of wireless terminals through pattern matching of deduced signal strengths
  Randomly Featured Patents
Method of manufacturing ferroelectric film capacitor
RF power amplifier linearization using parallel RF power amplifiers having intermod-complementing predistortion paths
Shaped article and process for preparing the article
Process for the preparation of Fipronil, an insecticide, and related pyrazoles
Energy storage system
Mixed esters of estradiol and zeranol
Linearized digital phase-locked loop method
Printing control method and apparatus using the same method
Sealant strip
Mechanical device productivity improvement with usage analysis, management, and implementation methodology for manufacturing facility