Chiplet Trust Level Mapping for Distributed Root-of-Trust Security
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Solution Overview
Problem
Existing electronic systems with multiple chiplets face security challenges due to vulnerabilities in one chiplet compromising the entire system, and integrating third-party chiplets is complex and error-prone, requiring a centralized Root of Trust (RoT) circuit to manage security policies across all chiplets, leading to increased complexity and inflexibility.
Innovation Solution
Implementing a RoT framework where each chiplet includes a local RoT circuit and a trust level mapping circuit to manage security policies within the chiplet, allowing each chiplet to assign trust levels to its own circuit resources and remap trust levels for transactions, with a primary RoT circuit managing only cross-chiplet transactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized RoT circuit is used to manage security policies across all chiplets, then security management is unified, but the RoT circuit complexity increases
Solution Approach 1:
The patent divides the centralized RoT circuit into multiple distributed RoT circuits, with each chiplet having its own RoT circuit. This segmentation reduces the complexity of any single RoT circuit while maintaining unified security management through standardized interfaces and protocols for inter-chiplet communication.
2Reliability
If a centralized RoT circuit is used to manage security policies across all chiplets, then security management is unified, but the system becomes less flexible
Solution Approach 1:
Each chiplet has its own RoT circuit that can independently manage security policies for that chiplet, providing flexibility and adaptability. At the same time, standardized interfaces enable coordinated security management across all chiplets, achieving both unity and flexibility.
Solution Approach 2:
Each chiplet's RoT circuit is optimized for that specific chiplet's security requirements, allowing customized security policies tailored to local needs while maintaining overall system security through standardized communication protocols.
3Adaptability or versatility
If third-party chiplets are integrated into the system, then system functionality is enhanced, but integration becomes more difficult and error-prone
Solution Approach 1:
The patent implements a universal RoT interface and standardized security protocols that work across all chiplets regardless of manufacturer or type. This universality simplifies the integration of third-party chiplets by providing consistent security management mechanisms that don't require customization for each chiplet source.
Solution Approach 2:
The RoT circuit acts as an intermediary that standardizes security interactions between different chiplets. By providing a common interface layer, it mediates security policies and transactions between diverse chiplet sources, making integration easier and more reliable.
4Reliability
If the security framework is redesigned to accommodate new chiplets, then security policies remain consistent, but redesign effort increases
Solution Approach 1:
The standardized RoT interface and security protocols are designed to be universally applicable across different chiplet types and manufacturers. This universality allows new chiplets to be integrated without requiring redesign of the security framework, as long as they comply with the standard interface requirements.
Data Source
AI summary
A device includes a plurality of chiplets. At least one pair of chiplets of the plurality of chiplets is coupled to one another. Each chiplet of the plurality of chiplets includes a Root-of-Trust (RoT) circuit and a trust level mapping circuit. For each chiplet of the plurality of chiplets, the trust level mapping circuit of the chiplet is configured to modify trust levels of transactions received from a different chiplet of the plurality of chiplets.