US6032257A — Hardware theft-protection architecture

Claim 1

Independent Claim 144 words

A method of theft protection, comprising the steps of: (a.) when a system is powered up, sending a site code, which at least partially identifies said system, to one or more protected components connected to said system; and (b.) in a protected component which contains memory space reserved for a unique authentication code which is not the same as the component's serial number: if said memory space contains an authentication code, testing said site code against said authentication code by a digital verification test, and enabling full operation of said component only if said testing is successful; and if said memory space does not contain said authentication code, then automatically generating said authentication code by digitally combining said site code with a unique serial number which is readably stored in nonvolatile memory on said component, and storing said authentication code in said memory space.

Claim 2

Independent Claim 144 words

A method of theft protection, comprising the steps of: (a.) when a system is powered up, sending a site code, which at least partially identifies said system, to one or more protected components connected to said system; and (b.) in a protected component which contains memory space reserved for a unique authentication code which is not the same as the component's serial number: if said memory space contains an authentication code, testing said site code against said authentication code by a digital verification test, and enabling full operation of said component only if said testing is successful; and if said memory space does not contain said authentication code, then automatically generating said authentication code by digitally combining said site code with a unique serial number which is readably stored in nonvolatile memory on said component, and storing said authentication code in said memory space.

Claim 3

Dependent Claim 29 words

The method of claim 1, wherein said component is hot-pluggable, and said steps (a.) and (b.) are also performed when said component is undergoing device self-testing after hotplug insertion.

Claim 4

Dependent Claim 17 words

The method of claim 1, wherein said site code is the unique serial number of said system.

Claim 5

Dependent Claim 17 words

The method of claim 1, wherein said digital verification test is a public-key/private-key digital signature verification test.

Claim 6

Dependent Claim 15 words

The method of claim 1, wherein a system CPU is programmed to perform said test.

Claim 7

Dependent Claim 19 words

The method of claim 1, wherein a microcontroller located on said new component is programmed to perform said testing.

Claim 8

Dependent Claim 26 words

The method of claim 1, wherein a microcontroller located on said new component is programmed to perform said testing and said microcontroller is a state machine.

Claim 9

Independent Claim 91 words

A method of theft protection in a computer system which includes a memory, at least-one processor unit, a non-volatile storage unit, a user input, and a user output, comprising the steps of: (a.) sending a site code from said processor unit to at least one protected component at power up; (b.) testing said site code, in combination with a unique serial number of said protected component, against a stored authentication code, in a digital verification test; and (c.) enabling full performance of said component only when said testing (b.) is successful.

Claim 10

Independent Claim 91 words

A method of theft protection in a computer system which includes a memory, at least-one processor unit, a non-volatile storage unit, a user input, and a user output, comprising the steps of: (a.) sending a site code from said processor unit to at least one protected component at power up; (b.) testing said site code, in combination with a unique serial number of said protected component, against a stored authentication code, in a digital verification test; and (c.) enabling full performance of said component only when said testing (b.) is successful.

Claim 11

Dependent Claim 16 words

The method of claim 8, wherein said testing is performed by a microcontroller on said component.

Claim 12

Dependent Claim 17 words

The method of claim 8, wherein said digital verification test is a public-key/private-key digital signature verification test.

Claim 13

Dependent Claim 17 words

The method of claim 8, wherein said site code is the unique serial number of said system.

Claim 14

Dependent Claim 29 words

The method of claim 8, wherein said component is hot-pluggable, and said steps (a.) and (b.) are also performed when said component is undergoing device self-testing after hot-plug insertion.

Claim 15

Independent Claim 108 words

A method of configuration control in a computer system which includes a memory, at least one processor unit, a non-volatile storage unit, a user input, and a user output, comprising, the steps of: (a.) reading a unique number from at least one protected component connected to said computer system; (b.) testing said unique number, in combination with a site code which at least partially identifies said system, against a stored authentication code which is different from said site code and from said unique number, using a digital verification test; and (c.) enabling full performance of said component in partial dependence on the outcome of said testing step (b.).

Claim 16

Independent Claim 108 words

A method of configuration control in a computer system which includes a memory, at least one processor unit, a non-volatile storage unit, a user input, and a user output, comprising, the steps of: (a.) reading a unique number from at least one protected component connected to said computer system; (b.) testing said unique number, in combination with a site code which at least partially identifies said system, against a stored authentication code which is different from said site code and from said unique number, using a digital verification test; and (c.) enabling full performance of said component in partial dependence on the outcome of said testing step (b.).

Claim 17

Dependent Claim 16 words

The method of claim 13, wherein said unique number is a serial number of said component.

Claim 18

Dependent Claim 14 words

The method of claim 13, wherein said testing is performed by said processor unit.

Claim 19

Dependent Claim 17 words

The method of claim 13, wherein said digital verification test is a public-key/private-key digital signature verification test.

Claim 20

Dependent Claim 29 words

The method of claim 13, wherein said component is hot-pluggable, and said steps (a.) and (b.) are also performed when said component is undergoing device self-testing after hot-plug insertion.

Claim 21

Dependent Claim 28 words

The method of claim 13, wherein said testing is performed both by said processor unit and also, independently, by a programmable processor which is part of said component.

Claim 22

Dependent Claim 17 words

The method of claim 13, ;herein said site code is the unique serial number of said system.

Claim 23

Dependent Claim 119 words

A computer system, comprising: a plurality of components comprising a memory, a system CPU, a nonvolatile storage unit, a user input, and a user output; wherein at least one said component comprises a microcontroller; first and second unique numbers stored in readable memory locations; wherein said first unique number uniquely identifies said component, and said second unique number is derived both from said first unique number, and also from a site code which at least partially identifies the system, in a predetermined transformation relationship; and wherein said microcontroller is programmed to digitally authenticate a system site code whenever a full power-up initialization occurs, using said second unique number, and in dependence thereon to enable full performance of said component.

Claim 24

Dependent Claim 119 words

A computer system, comprising: a plurality of components comprising a memory, a system CPU, a nonvolatile storage unit, a user input, and a user output; wherein at least one said component comprises a microcontroller; first and second unique numbers stored in readable memory locations; wherein said first unique number uniquely identifies said component, and said second unique number is derived both from said first unique number, and also from a site code which at least partially identifies the system, in a predetermined transformation relationship; and wherein said microcontroller is programmed to digitally authenticate a system site code whenever a full power-up initialization occurs, using said second unique number, and in dependence thereon to enable full performance of said component.

Claim 25

Dependent Claim 17 words

The system of claim 20, wherein said CPU is programmed to digitally authenticate during a Power-On-Self-Test procedure.

Claim 26

Dependent Claim 17 words

The system of claim 20, wherein said site code is the unique serial number of said system.

Claim 27

Dependent Claim 17 words

The system of claim 20, wherein said first unique number is the serial number of said component.

Claim 28

Dependent Claim 12 words

The system of claim 20, wherein said memory is a non-volatile memory.

Claim 29

Dependent Claim 14 words

The system of claim 20, wherein said microcontroller is implemented by a state machine.

Claim 30

Dependent Claim 22 words

The system of claim 20, wherein said microcontroller is programmed to enable operation of said component by way of a latching device.

Claim 31

Dependent Claim 78 words

A component, comprising: a microcontroller; a first unique number nonvolatilely stored at a readable address; and a nonvolatile memory operatively connected to said microcontroller; wherein upon first power-up in a system which provides a site code to said component, said microcontroller writes to said memory a second unique number which is not equal to said first unique number, and which is derived from said first unique number by a digital transformation which is dependent on said site code.

Claim 32

Dependent Claim 78 words

A component, comprising: a microcontroller; a first unique number nonvolatilely stored at a readable address; and a nonvolatile memory operatively connected to said microcontroller; wherein upon first power-up in a system which provides a site code to said component, said microcontroller writes to said memory a second unique number which is not equal to said first unique number, and which is derived from said first unique number by a digital transformation which is dependent on said site code.

Claim 33

Dependent Claim 17 words

The component of claim 27, wherein said site code is the unique serial number of said system.

Claim 34

Dependent Claim 12 words

The component of claim 27, further comprising a rotatable magnetic storage medium.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2003-02-28	2003-08-30	2004-02-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2007-02-28	2007-08-30	2008-02-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2011-02-28	2011-08-30	2012-02-29	$7700.00	Window Closed / Lapsed

Hardware theft-protection architecture

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