Destroyable Test Circuit for Integrated Circuit Security
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Solution Overview
Problem
Integrated circuit chips, particularly those with testing ports like the TAP interface, are vulnerable to hacker access, allowing extraction of security keys and private information, compromising information security systems.
Innovation Solution
A method involving the formation of a destroyable circuit on the chip, which is tested and then destroyed, eliminating the testing port as a source of vulnerability by removing or disabling the test circuitry, such as the TAP controller, using techniques like laser ablation or e-fuse blowing, ensuring the integrity of the device circuitry remains intact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a testing port (TAP interface) is incorporated in the integrated circuit for manufacturing testing, then the chip can be screened for process defects and functional confirmation, but the testing port becomes a vulnerability that hackers can exploit to extract security keys and private information
Solution Approach 1:
The patent applies preliminary action by destroying the test circuitry immediately after manufacturing testing is completed. The destroyable circuit is eliminated before the chip is shipped to customers, so the security vulnerability never exists in the final product while still allowing manufacturing testing to occur. This resolves the contradiction by performing the necessary testing action in advance and then removing the harmful element.
Solution Approach 2:
The patent extracts the test circuitry from the final product by designing it as separable destroyable circuit. The test controller and associated test logic are implemented in a manner that allows them to be physically removed or disabled after serving their manufacturing purpose. This extraction eliminates the security vulnerability while preserving the manufacturing testing capability.
2Productivity
If the testing port is left intact in the finished chip, then no additional destruction steps are needed in the manufacturing process, but the chip remains vulnerable to information extraction attacks
Solution Approach 1:
The destruction of test circuitry is performed as a preliminary action immediately after testing and before shipping. This additional step, while adding some process time, ensures that security vulnerabilities are eliminated. The productivity loss is minimal compared to the security benefits, and the destruction process is automated and integrated into the existing manufacturing flow.
Solution Approach 2:
The patent converts the potentially harmful test circuitry into a beneficial security feature by destroying it. The same circuitry that could be exploited by hackers is transformed into a security mechanism through controlled destruction. This approach turns what would be a continuous vulnerability into a temporary manufacturing aid that is then eliminated.
3Reliability
If destroyable circuitry is added to the chip for post-testing destruction, then security is enhanced by eliminating the testing port vulnerability, but the device complexity increases
Solution Approach 1:
The patent merges the destroyable test circuitry with the existing device circuitry areas. The test controller is integrated alongside the device logic, and the destruction mechanism is combined with existing chip structures. This merging approach minimizes the increase in device complexity while still providing the security benefit of eliminable test ports.
Solution Approach 2:
The destroyable circuit serves multiple functions: it enables manufacturing testing, provides a target for security-oriented destruction, and can be integrated with existing device logic. By making the test circuitry multi-functional and versatile in its design, the patent reduces the need for separate dedicated destruction circuits, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents unauthorized access by eliminating the testing port's potential for exploitation, enhancing the security of integrated circuit chips by ensuring that sensitive information cannot be obtained post-manufacturing, thereby fortifying information security systems.
Implementation Method 1
destroying the destroyable circuit subsequent to testing the at least one operational aspect of the device circuitry... using techniques like laser ablation
Data Source
AI summary
A method includes forming an integrated circuit device having device circuitry disposed in a device circuitry area on a substrate and a destroyable circuit formed in a destroyable circuitry area on the substrate; testing at least one operational aspect of the device circuitry using the destroyable circuit; and destroying the destroyable circuit subsequent to testing the at least one operational aspect of the device circuitry.