Single computer system having multiple security levels

Details Single computer system having multiple security levels Single computer system having multiple security levels

1996-06-14

1999-04-13

Beausoliel, Jr., Robert W.

G06F 1100

Patent

active

058945512

ABSTRACT:
A computer system is provided that allows a user to switch between at least two networks having different levels of security without transferring data between the two networks. The computer system comprises a standard computer which includes a central processing unit (CPU) coupled to a random access memory (RAM), a power supply and a reset switch. The computer is coupled to each of two different network cards, each of which is in turn connected to a separate storage device, such as a hard drive. Each combination of a network card connected to a storage device constitutes a network. As in a standard computer, activating the reset switch reboots the CPU and clears the RAM. A user chooses between the two networks by using a rotary switch, a rocker switch, or a push button switch which activates one of the networks or the reset switch. The switch is constructed so that it is impossible to switch between the two networks before first activating the reset switch, thereby preventing data from being transferred between the two networks. By preventing the transfer of data between the two networks, each of the systems can have a different level of security.

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Li, "Formalization of Self-Route Networks and the Rotary Switch", IEEE, pp. 438-446, 1994.

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