System and method of protecting integrity of computer data and software

• US 4,975,950 A
• Filed: 11/03/1988
• Issued: 12/04/1990
• Est. Priority Date: 11/03/1988
• Status: Expired due to Term

• Current Assignee: Mary E. Fisher
• Original Assignee: Stephen A. Lentz
• Inventors: Lentz, Stephen A.
• Primary Examiner(s): Cangialosi, Salvatore
• Application Number:
  US07/266,710
• Time in Patent Office: 761 Days
• Field of Search: 380/4, 380/24, 380/25, 364/200, 364/900
• US Class Current: 726/24
• CPC Class Codes: G06F 21/567 using dedicated hardware
• CPC Class Codes: G06F 21/575 Secure boot

Abstract

System and method for preventing alteration of stored data by computer virus. In a computer system which normally automatically boots an operating system when the central processing unit is initialized, a device is provided which takes control of the central processing unit before boot-up, checks the system files for computer virus and generates an alarm signal if a virus is detected.

In the preferred embodiment, the device quarantines an infected operating system to prevent alteration.

Claims

1. In a computer system, said system including

a central processing unit,

a main memory, having resident therein

a first program for controlling said central processing unit,

a storage memory, having resident therein

a second program for interfacing said storage memory with said system, and

data, and

means for sequentially

normally automatically transferring said second program to said main memory in response to initializing the central processing unit, and

transferring control of said central processing unit to said second program

the improvements in said computer system comprising means for sequentially:

(a) preventing said transfer of control;

(b) checking said second program to detect said virus; and

(c) generating an alarm signal if said virus is detected.

2. A method of operating a computer system which includes

a central processing unit,

a main memory, having resident therein

a first program for controlling said central processing unit,

a storage memory, having resident therein

a second program for interfacing said storage memory with said system, and

data, and

means for sequentially

normally automatically transferring said second program to said main memory in response to initializing the central processing unit, and

transferring control of said central processing unit to said second program,

said method comprising the steps of sequentially:

(a) preventing said transfer of control;

(b) checking said second program to detect said virus; and

(c) generating an alarm signal if said virus is detected.