Memory Chip Test Pad Access Control Against Data Cloning
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Solution Overview
Problem
Test pads on non-volatile memory chips pose significant data security risks, allowing unauthorized access and potential attacks, such as data cloning and implanting backdoor programs, which can compromise critical systems.
Innovation Solution
Implementing an access control unit with internal logic and secure protocols to manage access to non-volatile memory via test pads, using replay-protected communication and authentication mechanisms to ensure legitimate commands are validated before connecting test pads to memory, and disconnecting unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If test pads are directly connected to memory pads to facilitate testing and manufacturing, then ease of manufacture and testing is improved, but data security deteriorates due to vulnerability to data cloning and unauthorized access
Solution Approach 1:
An access control unit is introduced as an intermediary component between the test pads and the memory pads. This mediator validates authentication signals and control signals before allowing test pads to access memory pads, thereby enabling secure testing while preventing unauthorized data access and cloning operations
Solution Approach 2:
The system performs preliminary authentication of signals attempting to access the memory pads through test pads. The access control unit verifies authentication signals and valid commands before enabling any data access, ensuring that only authorized operations can proceed while maintaining the direct connection structure for manufacturing efficiency
2Object-affected harmful factors
If access control mechanisms are added to manage test pad access, then data security is improved, but device complexity increases due to additional control logic and authentication protocols
Solution Approach 1:
The access control unit combines multiple security functions including authentication signal validation, command verification, and access authorization into a single integrated component. This merging approach provides comprehensive security while minimizing the increase in overall device complexity by consolidating control logic rather than adding separate security modules
Data Source
AI summary
A system for providing memory chip test pad access management to facilitate data security is disclosed. A host issues a command to access a non-volatile memory of a memory chip system via a test pad. A controller acknowledges the command by transmitting a response to the host to authenticate the host for access. The host then issues an authenticated command to modify a reserved byte of a protected memory partition of the non-volatile memory. The controller responds to the authenticated command and the reserved byte is modified. Firmware of the memory chip system monitors the modification of the reserved byte and notifies the memory chip system to activate a switch in an access control unit controlling access to the non-volatile memory. The switch is then activated, thereby closing a circuit to connect the test pad with the non-volatile memory. The host then access the non-volatile memory via the test pad.