US Patent No: 7,975,151

Number of patents in Portfolio can not be more than 2000

Decryption key table access control on ASIC or ASSP

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Importance

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Abstract

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An ASIC or ASSP has processor circuitry (110), a predetermined initialization program (100) for execution by the processor circuitry at power up, and a non-volatile key table (120) readable by the initialization program, and not accessible otherwise by the processor circuitry. The initialization program reads a key index associated with encrypted data, from external memory, and uses the key index to read a corresponding key from the table, to decrypt the encrypted data for use by the processor circuitry. Optionally another key is first decrypted and used for the decryption of the encrypted data. By keeping the key on board the chip and restricting access in this way, the key and therefore the encrypted data can be protected from software based reverse engineering. This means the encrypted data can cheaper memory chips or other storage. Thus the processor circuitry can be formed on a smaller integrated circuit.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCPHOENIX, AZ3016

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Coenen, Ivo Leonardus Neuchâtel, CH 2 5

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
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MICRON TECHNOLOGY, INC. (1)
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NOKIA TECHNOLOGIES OY (1)
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XILINX, INC. (1)
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GIGA-BYTE TECHNOLOGY CO., LTD. (1)
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ARM LIMITED (1)
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RPX CORPORATION (1)
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MICROSOFT TECHNOLOGY LICENSING, LLC (1)
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The United States of America as represented by the United States Department of Energy (1)
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Texas Instruments Incorporated (1)
* 2006/0204,004 System and method for secure authentication of a "smart" battery by a host 23 2005
 
ABOV SEMICONDUCTOR CO., LTD. (1)
* 2003/0105,967 Apparatus for encrypting data and method thereof 24 2002
 
LG ELECTRONICS INC. (1)
* 2007/0067,646 Recording medium, apparatus for decrypting data and method thereof 2 2006
 
TV INTERACTIVE DATA CORPORATION (1)
* 5,711,672 Method for automatically starting execution and ending execution of a process in a host device based on insertion and removal of a storage media into the host device 39 1995
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP (2)
* 9,465,660 Performing a task in a system having different types of hardware resources 0 2011
* 2014/0007,128 PERFORMING A TASK IN A SYSTEM HAVING DIFFERENT TYPES OF HARDWARE RESOURCES 1 2011
 
FREESCALE SEMICONDUCTOR, INC. (2)
* 9,436,846 Semiconductor device and a method of manufacturing a semiconductor device 0 2012
* 2015/0100,792 SEMICONDUCTOR DEVICE AND A METHOD OF MANUFACTURING A SEMICONDUCTOR DEVICE 0 2012
 
XILINX, INC. (1)
* 9,483,416 Secure processor operation using integrated circuit configuration circuitry 0 2010
* Cited By Examiner

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