“J” system for securing a portable computer which optionally requires an entry of an invalid power on password (POP), by forcing an entry of a valid POP

• US 6,418,533 B2
• Filed: 08/29/1997
• Issued: 07/09/2002
• Est. Priority Date: 08/29/1997
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Information Technologies Group LP (HP Inc.)
• Inventors: Angelo, Michael F., Olarig, Sompong P.
• Primary Examiner(s): Lee, Thomas
• Assistant Examiner(s): Park, Ilwoo
• Application Number:
  US08/927,096
• Publication Number:
  US 20010013098A1
• Time in Patent Office: 1,775 Days
• Field of Search: 713/200, 713/201-202, 713/1, 713/100, 714/36
• US Class Current: 726/19
• CPC Class Codes: G06F 21/31 User authentication
• CPC Class Codes: G06F 21/575 Secure boot
• CPC Class Codes: G06F 2211/1097 Boot, Start, Initialise, Power
• CPC Class Codes: G08B 13/1418 Removal detected by failure in electrical connection between the appliance and a control centre, home control panel or a power supply

Abstract

A computer security system whereby access is controlled by remote enablement or disablement. The system can be coupled with third-party products to accommodate satellite transmissions for long-distance access control.

Claims

1. A portable computer, which optionally requires entry of a valid Power On Password during system initialization and said computer is currently not requiring the entry thereof, comprising:

a microprocessor;

Power On Self Test (POST) code that is executed by said microprocessor during system initialization, said POST code can require a user to enter a Power On Password (POP) to enable system operation, and if the POST code requires a POP and a valid POP is not entered the computer will not complete system initialization and will be non-operational;

an input/output device operatively coupled to said microprocessor; and

a battery-backed wireless RF receiver operatively coupled to said microprocessor;

wherein said computer implements a security mode which can be remotely activated either by transmitting a security command to said wireless RF receiver whether the computer is on or off or by the receiver failing to receive a periodic status signal; and

wherein said security mode includes, if the computer is off when the security mode is activated, forcing a user to enter a valid POP the next time the computer is turned on.

2. The portable computer of claim 1 further including a nonvolatile memory coupled to said wireless RF receiver in which a bit is set to activate the security mode.

3. The portable computer of claim 1 wherein said security mode sets a bit in the nonvolatile memory, which blows a fuse in a logic circuit to require a valid POP to enable operation of the system.

4. The portable computer of claim 1 wherein, if the computer is in a sleep or suspend state when the security mode is activated, the user will be required to enter a valid POP to enable the computer when the computer transitions to a working state.

5. A method of securing a portable computer which optionally requires entry of a valid Power On Password during system initialization and said computer is currently not requiring the entry thereof, comprising:

receiving a periodic security message from an RF transmitting source whether the computer is on or off; and

activating a security mode either when the next of said periodic security messages is not received or when a security activation signal is received;

wherein when the computer is off, responding to the activation of the security mode by requiring entry of a valid POP to enable system operation during subsequent system initialization.

6. The method of claim 5, wherein activating the security mode includes setting a bit in a nonvolatile memory and setting said bit can be performed even if the computer is off.

7. The method of claim 5 wherein activating the security mode includes blowing a fuse in a logic circuit to cause a bit in a non-volatile memory to be set, and blowing said fuse can be performed even if the computer is off.

8. The method of claim 5, wherein, if the computer is in a sleep, suspend or hibernation state when the security mode is activated, responding to the activation of the security mode by requiring a valid POP to enable the system operation during the subsequent transition to a working state from said sleep, suspend or hibernation state.

9. The method of claim 5, wherein when the computer is on, responding to the activation of the security mode by forcing a reset of the computer and requiring entry of a valid Power On Password (POP) to enable system operation during subsequent system initialization.

10. A portable computer, which optionally requires entry of a valid Power On Password during system initialization, comprising:

a microprocessor;

a nonvolatile memory device;

a trouble bit within said nonvolatile memory device that identifies whether the portable computer runs in a normal mode or a security mode;

a Power On Self Test (POST) code that is executed by said microprocessor during system initialization, said POST code can require a user to enter a Power On Password (POP) to enable system operation, and if the POST code requires a POP and a valid POP is not entered the computer will not complete system initialization and will be non-operational;

an input/output device operatively coupled to said microprocessor; and

a battery-backed wireless RF receiver operatively coupled to said microprocessor and to said trouble bit in nonvolatile memory;

wherein said computer implements a security mode that is initiated by setting the trouble bit and which can be remotely activated either by transmitting a security command to said wireless RF receiver whether the computer is on or off or by the receiver failing to receive a periodic status signal; and

wherein when said trouble bit is set, if the computer is on when the security mode is activated, the computer is disabled by forcing the computer to perform a system reset and requiring a user to enter a valid POP, or, if the computer is off when the trouble bit is set, forcing a user to enter a valid POP the next time the computer is turned on.

11. The portable computer of claim 10 wherein, if the computer is in a sleep or suspend state when the security mode is activated, the user will be required to enter a valid POP to enable the computer when the computer transitions to a working state.

12. The portable computer of claim 11 wherein said security mode blows a fuse in a logic circuit to require a valid POP to enable operation of the system.

13. A method of securing a portable computer which optionally requires entry of a valid Power On Password during system initialization, comprising:

receiving a periodic security message from an RF transmitting source whether the computer is on or off; and

activating a security mode either when the next of said periodic security messages is not received or when a security activation signal is received; and

enabling said security mode by setting a bit in nonvolatile memory;

responding to the setting of said bit by

I. when the computer is off, requiring entry of a valid POP to enable system operation during subsequent system initialization;

or

ii. when the computer is on, forcing a reset of the computer and requiring entry of a valid Power On Password (POP) to enable system operation during subsequent system initialization.

14. The method of claim 13 wherein activating the security mode includes blowing a fuse in a logic circuit to cause the bit in nonvolatile memory to be set, and blowing said fuse can be performed even if the computer is off.

15. The method of claim 14, wherein, if the computer is in a sleep, suspend or hibernation state when the security mode is activated, responding to the activation of the security mode by requiring a valid POP to enable the system operation during the subsequent transition to a working state from said sleep, suspend or hibernation state.