Resistive Memory PUF for Secure IoT Authentication
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Solution Overview
Problem
Current non-volatile memory devices face challenges in providing secure encryption and mutual authentication due to vulnerabilities in encryption keys, particularly against side-channel attacks, and require low power consumption and small form factor for integration into IoT devices.
Innovation Solution
A non-volatile memory device with a physically unclonable function (PUF) that generates individual identification information based on the resistance variations of resistive memory cells, using a read circuit to obtain time information from memory cells and a data generation circuit to create unique digital ID data, enhancing security and resistance to side-channel attacks while minimizing power consumption and space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption techniques based on program processing are used, then security level is improved, but vulnerability to side-channel attacks increases
Solution Approach 1:
The patent replaces software-based encryption mechanisms with a hardware-level physically unclonable function (PUF) that exploits physical variations in resistive memory cells. This substitution moves security from the software domain to the physical domain, making attacks requiring observation of physical states (side-channel attacks) ineffective.
Solution Approach 2:
The patent utilizes inherent parameter variations (resistance values) among memory cells that are uncontrollable and non-reproducible. These physical parameters serve as the basis for generating unique identification information, transforming uncontrollable physical variations into a security advantage that prevents cloning.
2Reliability
If PUF function is implemented using memory cells with variable resistance values, then individual identification information generation is improved, but power consumption increases
Solution Approach 1:
The patent makes the memory cell array serve dual functions: storing user data and generating PUF-based identification information. By utilizing the same hardware infrastructure for both purposes, the patent avoids adding separate dedicated PUF circuitry that would increase power consumption, while still achieving secure identification.
Solution Approach 2:
The memory cells themselves provide the PUF function through their inherent resistance variations without requiring external specialized components. The system uses the natural physical properties of the memory cells to generate identification information, eliminating the need for additional energy-intensive PUF generation hardware.
3Reliability
If PUF function is implemented using memory cells with variable resistance values, then individual identification information generation is improved, but device area increases
Solution Approach 1:
The patent makes the memory cell array serve dual functions: storing user data and generating PUF-based identification information. By utilizing the same hardware infrastructure for both purposes, the patent avoids adding separate dedicated PUF circuitry that would increase device area, while still achieving secure identification.
Solution Approach 2:
The patent merges the data storage function and PUF generation function into a single integrated system. The memory cell array is combined to perform both user data storage and secure identification generation, eliminating the need for separate physical components and reducing overall device footprint.
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
The solution provides secure and stable digital ID data generation with high randomness and resistance to side-channel attacks, suitable for low-power IoT devices, ensuring secure encryption and authentication without physical reproduction.
Implementation Method 1
The read circuit obtains each of the pieces of time information on a basis of a discharge phenomenon or charge phenomenon that depends on the resistance value of a corresponding one of the memory cells
Implementation Method 2
The read circuit obtains each of the pieces of time information on a basis of a discharge phenomenon or charge phenomenon that depends on the resistance value of a corresponding one of the memory cells
Data Source
AI summary
A non-volatile memory device comprises: a memory cell array that includes one or more memory groups each including memory cells, each of the memory cells having variable resistance value to hold a piece of data; a read circuit that, for each of the one or more memory groups, performs a read operation to obtain pieces of time information related to the memory cells in the memory group; and a data generation circuit that generates individual identification information on a basis of order of the memory cells in each of the one or more memory groups, the order corresponding to ascending order or descending order of the pieces of time information related to the memory cells in the memory group. The read circuit obtains each of the pieces of time information on a basis of a discharge phenomenon or charge phenomenon that depends on the resistance value of a corresponding one of the memory cells.