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Security System for Personal Computers

IP.com Disclosure Number: IPCOM000040170D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 13K

Publishing Venue

IBM

Related People

Bealkowski, R: AUTHOR [+10]

Abstract

A technique is described whereby a password security system is built into a personal computer to limit access to the computer at power-on time or if security is desired while power is on. The system is operational only if the proper keyboard security code is entered. It is an improvement over prior concepts which used physical lock and key arrangements to provide the security needed. A diskette program is supplied with every personal computer (PC) so as to enable the user to install a password into non-volatile random-access memory (RAM). A program on the diskette is used to initiate the password code from the keyboard by the user. Once established, the code must be entered by the user during power-up time. During power-up time, the password code is also stored in the keyboard controller's RAM.

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Security System for Personal Computers

A technique is described whereby a password security system is built into a personal computer to limit access to the computer at power-on time or if security is desired while power is on. The system is operational only if the proper keyboard security code is entered. It is an improvement over prior concepts which used physical lock and key arrangements to provide the security needed.

A diskette program is supplied with every personal computer (PC) so as to enable the user to install a password into non-volatile random-access memory (RAM). A program on the diskette is used to initiate the password code from the keyboard by the user. Once established, the code must be entered by the user during power-up time. During power-up time, the password code is also stored in the keyboard controller's RAM. Once the security password code is set in the keyboard controller, at power-up time, an 'Enable Security' command sent to the controller will cause the controller to prohibit the passage of keyboard or auxiliary device data to the PC. The security password code will intercept keyboard data information and compare the coding against the installed password pattern. Until a match is encountered, all keyboard and auxiliary device data will be prohibited from passing to the central processing unit (CPU), and the data entered by the user will be lost. When a match is encountered, the state of the controller is restored and data is allowed to pass to the CPU. A program, different from the program that initializes the password in non-volatile RAM, is used to send the 'Enable Security' command to the keyboard controller. A 'Test Password Installed' command, not part of the diskette supplied, enables the user to determine if a password is previously installed. This feature may be used...