US Patent No: 6,246,970

Number of patents in Portfolio can not be more than 2000

Method for making a chip tamper-resistant

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Abstract

A method of detecting tampering with an integrated circuit using circuit paths extending in the integrated circuit and carrying signals which are compared to each other, and to thresholds, and providing an output signal in the event that predetermined signal conditions occur. The predetermined signal conditions which occur may be a change of state of an output of a gate which interconnects the two circuit paths, or a change of state of the output of testing circuitry which tests signals in at least one of the circuit paths against a threshold. In a further aspect the invention concerns an integrated circuit chip provided with tamper detecting circuitry.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SILVERBROOK RESEARCH PTY LTDBALMAIN4414

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Silverbrook, Kia Balmain, AU 7991 34589
Walmsley, Simon Robert Balmain, AU 1072 4023

Cited Art

Patent Info (Count) # Cites Year
 
Honeywell Inc. (1)
5,153,532 Noise generator using combined outputs of two pseudo-random sequence generators 40 1989

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ATMEL CORPORATION (3)
8,099,783 Security method for data protection 0 2006
7,352,203 Method to reduce power in active shield circuits that use complementary traces 3 2006
7,622,944 Method to reduce power in active shield circuits that use complementary traces 2 2008
 
SILVERBROOK RESEARCH PTY LTD (3)
8,005,636 Method of controlling clock signal 0 2009
7,996,880 Secure updating of integrated circuits 0 2010
8,038,239 Controller for printhead having arbitrarily joined nozzle rows 0 2010
 
CISCO TECHNOLOGY, INC. (2)
6,880,752 System for testing, verifying legitimacy of smart card in-situ and for storing data therein 14 2003
8,242,775 Tamper-detecting electronic system 0 2007
 
INFINEON TECHNOLOGIES AG (2)
7,103,494 Circuit arrangement and data processing method 0 2004
6,962,294 Integrated circuit having an active shield 2 2004
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
8,089,285 Implementing tamper resistant integrated circuit chips 0 2009
8,436,638 Switch to perform non-destructive and secure disablement of IC functionality utilizing MEMS and method thereof 0 2010
 
SUN MICROSYSTEMS, INC. (2)
7,409,545 Ephemeral decryption utilizing binding functions 4 2003
7,363,499 Blinded encryption and decryption 3 2003
 
ZAMTEC LIMITED (2)
7,976,116 Inkjet printer system having equalised control of different nozzle count printhead ICs 0 2009
8,370,260 Printing system for validating printing consumable 0 2010
 
COMMISSARIAT A L'ENERGIE ATOMIQUE (1)
8,110,894 Protection for an integrated circuit chip containing confidential data 0 2004
 
INSIDE SECURE (1)
8,457,919 Process for testing the resistance of an integrated circuit to a side channel analysis 0 2010
 
LOCKHEED MARTIN CORPORATION (1)
6,559,550 Nanoscale piezoelectric generation system using carbon nanotube 31 2001
 
PROTON WORLD INTERNATIONAL N.V. (1)
8,150,029 Detection of a disturbance in a calculation performed by an integrated circuit 0 2006
 
STMICROELECTRONICS S.A. (1)
7,146,509 Method and device for protecting integrated circuits against piracy 1 2001