Patent ID: 6351817
Filing Date: 2002-02-26
Classification: G06F

Abstract:
A multilevel computer security system comprising:a core computer including a central processor unit (CPU), random access memory (RAM), and a computer-power supply with the CPU coupled to and controlling the operation of devices and data interfaces, within the multilevel computer security system, for data processing, data communications, and data storage; a first security subsystem coupled to the core computer via a data bus, having means for storing the data and communicating data at a first security level; at least one additional-security subsystem coupled to the core computer via the data bus, with each of said additional-security subsystems having means for storing data at a designated and exclusive security level higher than the first security level, each of the additional-security subsystems including power-indicator means for illuminating when the additional-security subsystem is receiving power from said computer-power supply; access control means that process access requests and identification information from a user and correlate it with the security identification requirements and access privilege information within a security token possessed by the user to output an activation signal representative of the security level that is granted to the user; security level sensor means that enable the transmission of said activation signal from the access control means to the electronically-activated power switching means only if the additional-security subsystem is determined by said sensor means to be at a security level corresponding to the security level represented by said activation signal; electronically-activated power switching means, responsive to the electronic activation signals from said access-control means for selecting a security subsystem at said security level granted to said user and connecting power from the computer power-supply to only said selected security subsystem, thereby isolating said powered security subsystem and the data at its designated security level from all other security subsystems.