Memory Timing PUF Authentication via Error Patterns
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Solution Overview
Problem
Existing challenge-response authentication protocols are vulnerable to physical and software-based attacks, and they lack efficiency and reliability in identifying computer systems.
Innovation Solution
The use of physical unclonable functions (PUFs) in computer systems, specifically by manipulating the Row Address to Column Address Delay (tRCD) timing parameter of memory, generates unique error patterns that serve as a response in authentication protocols, making it difficult to duplicate or clone the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional challenge-response authentication protocols are used, then authentication functionality is provided, but the system is vulnerable to physical and software-based attacks
Solution Approach 1:
The patent converts memory errors, which are typically harmful defects, into beneficial unique identifiers for authentication. By intentionally operating memory outside its specified operating range to generate reproducible error patterns, the system transforms a vulnerability into a security feature that is difficult to replicate or clone.
Solution Approach 2:
The system changes the operating parameters of the memory device by programming the tRCD timing parameter to a value outside the manufacturer-specified operating range. This parameter change causes the memory to operate in an unstable region that generates consistent, unique error patterns specific to each memory device, enabling secure authentication.
2Reliability
If memory timing parameters are programmed outside specified operable range to generate unique error patterns, then authentication reliability is improved, but memory operation stability deteriorates
Solution Approach 1:
The system performs preliminary actions by intentionally creating unstable operating conditions during the authentication process. The memory is programmed with timing parameters outside the operating range specifically for authentication operations, allowing controlled generation of unique error patterns while maintaining stability for normal operations.
Solution Approach 2:
The system dynamically adjusts memory operating parameters based on the operational context. The tRCD timing parameter is programmed to different values depending on whether the memory is performing authentication operations or normal data storage/retrieval, allowing the system to optimize for either security or stability as needed.
3Reliability
If physical unclonable functions based on memory timing characteristics are used, then authentication security is improved, but authentication time increases
Solution Approach 1:
The patent replaces complex physical PUF systems with a simpler software-based approach that manipulates memory timing parameters. Instead of relying on complex physical structures to generate unique identifiers, the system uses software-controlled timing parameter programming to induce and capture unique error patterns, significantly reducing authentication time while maintaining security.
Data Source
AI summary
Techniques are disclosed for obtaining data using memory timing characteristics. In some embodiments, a physical unclonable function is used to obtain the data. In various embodiments, a computer system programs a timing parameter of a memory accessible by the computer system to a value that is outside of a specified operable range for the timing parameter. In various embodiments, the computer system performs one or more memory operations to a least a portion of the memory and detects a pattern of errors in the portion of the memory. In some embodiments, the computer system generates a response dependent on the pattern of errors. The response may be used to identify the computer system.