Ferroelectric Memory Erasure Using Tamper-Triggered Joule Heating
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Solution Overview
Problem
Ferroelectric memory devices are vulnerable to unauthorized access, as data stored in them can be compromised by physical tampering, which jeopardizes the security of cryptographic keys and stored information.
Innovation Solution
A non-volatile memory structure incorporating a proximity heater that generates Joule heating to increase the temperature of the ferroelectric material layer above its Curie temperature, effectively erasing memory when tampering is detected, thereby enhancing security by ensuring data protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proximity heater is added to enable memory erasure upon tampering detection, then data security is improved, but device complexity increases
Solution Approach 1:
The proximity heater is integrated within the existing memory device structure, nested among the memory cells it protects. This embedding approach allows the security feature to be incorporated without adding external components, thereby improving data security while minimizing the increase in device complexity.
Solution Approach 2:
The proximity heater serves multiple functions: it acts as a standard heater for normal memory operations and simultaneously functions as a security mechanism for memory erasure upon tampering detection. This multi-functionality allows the same component to address both operational needs and security requirements, improving reliability without proportionally increasing device complexity.
2Use of energy by moving object
If the proximity heater is positioned closer to the ferroelectric material layer, then heating efficiency is improved, but risk of unauthorized activation increases
Solution Approach 1:
The proximity heater is positioned at specific locations adjacent to the ferroelectric material layer, creating localized heating zones. This selective positioning optimizes heating efficiency for the critical memory regions while maintaining sufficient distance to reduce the risk of unauthorized activation, balancing thermal performance with security considerations.
Solution Approach 2:
The proximity heater acts as an intermediary component between the control circuitry and the ferroelectric material layer. It receives controlled signals from the detection system and translates them into localized thermal effects, providing a buffered interface that enables efficient heating while maintaining security through controlled activation protocols.
3Reliability
If Joule heating is used to raise temperature above Curie temperature, then memory erasure effectiveness is improved, but energy consumption increases
Solution Approach 1:
The system utilizes Joule heating to dynamically change the temperature parameter of the ferroelectric material layer, raising it above the Curie temperature to achieve effective memory erasure. By controlling the duration and intensity of the heating pulse, the system achieves reliable erasure while managing energy consumption through precise parameter optimization.
Solution Approach 2:
The Joule heating is applied as a periodic or pulsed action rather than continuous heating. The heater is activated only when tampering is detected, creating a time-limited thermal event that achieves the necessary temperature rise for erasure while minimizing overall energy consumption compared to sustained heating approaches.
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 erasure of memory in ferroelectric memory devices, ensuring that sensitive information, such as cryptographic keys, is protected from unauthorized access by triggering memory erasure upon detection of tampering attempts, thus maintaining data integrity and security.
Implementation Method 1
the proximity heater is configured to generate Joule heating to increase temperature of the ferroelectric material layer higher than a Currie temperature of the ferroelectric material layer
Implementation Method 2
the information is based on polarization in the ferroelectric layer, which is switchable based on the electric field, and will be non-ferroelectric once the temperature of the ferroelectric layer is above the Curie temperature
Data Source
AI summary
A non-volatile memory (NVM) structure is provided including a proximity heater or a localized heater that is configured to generate Joule heating to increase temperature of a ferroelectric material layer of a ferroelectric memory device higher than a Currie temperature of the ferroelectric material layer. The Joule heating is trigged when tampering in the NVM structure is detected and as a result of the Joule heating memory erasure can occur.