Memory Lockdown Architecture for Persistent Tamper-Resistant Access Control
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Solution Overview
Problem
Existing multi-port memory systems, such as SSDs, are vulnerable to cyber-attacks that disrupt critical functions due to insufficient persistent protection and resilience against sophisticated DOS attacks, particularly when lower-security systems like IVI systems compromise higher-security systems like ADAS, and existing software-based lockdown features can be altered or reset by power cycling.
Innovation Solution
Implementing authentication-based and hardware-based lockdown features, where operations are locked down using authentication-key-protected or hardware-pin-protected portions of the memory system, ensuring configurations persist across power cycles and require secure passwords or physical engagement to change, enhancing security against unauthorized modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based lockdown features are implemented, then security control over memory operations is improved, but the lockdown configurations can be altered or reset by power cycling, reducing reliability
Solution Approach 1:
The patent segments the lockdown configuration into two distinct parts: volatile software-based lockdown settings that can be changed during operation, and non-volatile authentication-based lockdown settings that persist across power cycles. This segmentation allows the system to maintain both ease of operation for temporary lockdowns and reliability for persistent security requirements, resolving the contradiction between configuration persistence and implementation complexity.
2Reliability
If authentication-based lockdown is implemented, then protection against unauthorized modifications is improved, but system complexity increases due to additional security layers
Solution Approach 1:
The patent implements a dynamic security system where the lockdown mechanism adapts based on the threat level and operational context. The system can operate in different modes: standard software-based lockdown for routine operations, authentication-based lockdown for enhanced security requirements, and hardware-based lockdown for critical protections. This dynamic approach allows the system to provide high security when needed while maintaining lower complexity during normal operations, resolving the contradiction between security strength and system complexity.
3Reliability
If hardware-based lockdown features are implemented, then resilience against sophisticated DOS attacks is improved, but ease of operation is reduced due to physical engagement requirements
Solution Approach 1:
The patent applies different quality levels of security to different parts of the system based on their specific requirements. Critical memory operations and data regions receive hardware-based lockdown protection with physical engagement requirements, while less critical functions use simpler software-based lockdown. This localized application of security measures provides maximum protection where needed while maintaining ease of operation for routine tasks, resolving the contradiction between attack resilience and operational ease.
Data Source
AI summary
In some implementations, a memory system may receive a lockdown command associated with one or more operations of the memory system, wherein the lockdown command indicates, for each operation: whether the operation is to be locked down using an authentication-based lockdown feature, and whether the operation is to be locked down using a hardware-based lockdown feature. The memory system may perform at least one of: storing a first lockdown configuration associated with a first operation in an authentication-key-protected portion of the memory system when the lockdown command indicates that the first operation is to be locked down using the authentication-based lockdown feature; or storing a second lockdown configuration associated with a second operation in a hardware-pin-protected portion of the memory system when the lockdown command indicates that the second operation is to be locked down using the hardware-based lockdown feature.