Encrypting method and apparatus enabling multiple access for multiple services and multiple transmission modes over a broadband communication network

摘要: The specification relates to the encryption of data transmitted over a broadband multiple access bi-directional hybrid fiber/coax (HFC) network. method supports downstream broadcast from headend cable modem, and also provides for transmissions modems back headend. Although present invention is described in relation an HFC network, it equally applicable cellular wireless communications environment or any other digital medium. implemented two subdivisions, slow but secure software encrypting algorithm, fast less hardware algorithm. combination produces security subdivision, with speed subdivision. apparatus various transmission modes, such as STM, ATM, VL. utilizes virtual random number generator at individual reduce modem hardware. authentication key generation process between mutually authenticated generated permanent key. features cryptosync clock which clock, thus eliminating need each modem.