Patent ID: 7991993

Claim:
A telecommunication system including a plurality of terminals divided into groups and connected to a first telecommunication network, such that within a first group each terminal of said first group is configured to send multidestination messages to other terminals of said first group, wherein each terminal of said first group is associated with an encryption and decryption device so that each terminals of said first group is configured to send multidestination messages via the first telecommunication network that can only be decrypted by the other terminals of said first group, wherein said plurality of terminals are connected to a terrestrial cable network and are configured to supply messages received from said first telecommunication network and decrypted by the respective encryption and decryption device to said cable network, and further configured to supply messages received from said cable network and encrypted by the respective encryption and decryption device to said first telecommunication network, and the system further including a central server configured to distribute encryption and decryption keys to each encryption and decryption device for secure transmission of communications within each group.