DATA SCRAMBLING SYSTEM FOR A SHARED TRANSMISSION MEDIUM

摘要

Methods of providing added security for communications between a server (36) and a particular client modem (70) on a shared communication media (50). The methods provide for passing communications containing scrambled keys to be used to form scrambling seeds for scrambling subsequent messages. In a preferred embodiment, both the server (36) and the client modem (70) generat e and pass keys to be used for the communications between the server (36) and that client modem (70) to achieve a dynamic dual key scrambling system. In t he preferred embodiment, the MAC or medium access control address for each clie nt modem is used as a seed for encryption. Additionally, a seed based on the mo st recent CRC code from the last received data packet is used.