Hot Pluggable Device Circuit Asserts TPM Physical Presence
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Solution Overview
Problem
Existing Trusted Platform Module (TPM) systems lack a user-friendly method to assert physical presence without requiring complex operations like removing the node from a chassis or toggling switches, which compromises security and usability.
Innovation Solution
A compute node with a circuit that detects changes in the physical connection of a hot pluggable device to a port and asserts a physical presence signal to the TPM, allowing users to connect, disconnect, or reconnect devices to assert presence, optionally requiring multiple changes within a time frame or enabling through a software interface for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional methods are used to assert physical presence to TPM, then security can be maintained, but user operation becomes complex and difficult
Solution Approach 1:
The system automatically detects the insertion/removal of hot pluggable devices and asserts physical presence to the TPM without requiring user intervention or complex operations. The circuit autonomously monitors physical connection changes and communicates with the TPM, eliminating the need for users to perform manual presence assertion operations.
Solution Approach 2:
The patent replaces complex mechanical presence assertion mechanisms (such as physical switches, buttons, or manual configuration) with an automated electrical detection system. The circuit detects physical connection changes through electrical signals from hot pluggable devices and automatically asserts presence to the TPM, substituting mechanical user actions with automated electrical detection and communication.
2Ease of operation
If simple presence detection is implemented, then ease of operation improves, but security protection may be compromised
Solution Approach 1:
The system continuously monitors physical connection changes of hot pluggable devices and provides feedback to the TPM about the current physical state. This feedback mechanism ensures that the TPM receives accurate, real-time information about physical presence, enabling it to make informed security decisions while maintaining both simplicity and security.
Solution Approach 2:
The circuit is pre-configured to automatically detect and report physical connection changes to the TPM before any security-critical operations occur. By establishing physical presence verification in advance, the system ensures security protections are in place before potential tampering can occur, maintaining both simplicity and reliability.
Data Source
AI summary
A compute node includes a motherboard having a trusted platform module, and also includes a port for selectively coupling a hot pluggable device into communication with the motherboard. The compute node further includes a circuit coupled to the port for detecting a change in the physical connection of the hot pluggable device to the port and for asserting a physical presence signal to the trusted platform module in response to detecting a change in the physical connection of the hot pluggable device to the port. The change in the physical connection of the hot pluggable device to the port may include either physically connecting the hot pluggable device to the port, physically disconnecting the hot pluggable device from the port, or a combination thereof.