BIOS Controller Communication Security via Encryption Key Verification
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Solution Overview
Problem
Existing information handling systems lack secure and reliable communication mechanisms between the BIOS and controller, particularly in managing sensitive operations and preventing unauthorized access.
Innovation Solution
A system and method that initializes communication between the BIOS and controller, using encryption to secure commands and ensuring only trusted code can access critical operations, with the BIOS encrypting commands and the controller verifying them using a shared key, while allowing non-critical commands to be accessible to non-trusted code.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller stores sensitive information such as passwords and encryption keys, then the system security is improved, but the risk of unauthorized access and system integrity threats increases
Solution Approach 1:
The BIOS encrypts commands before sending them to the controller, establishing security measures in advance before any unauthorized access can occur. This preliminary encryption action ensures that even if the controller is compromised, the commands remain protected.
Solution Approach 2:
The patent introduces an encryption key as an intermediary between the BIOS and controller. The key is stored in the controller but can only be used by authenticated BIOS commands, creating a secure mediation layer that prevents unauthorized access while allowing legitimate operations.
2Adaptability or versatility
If the controller manages critical system operations such as power management and boot processes, then the system functionality is improved, but the potential impact of malicious code execution increases
Solution Approach 1:
The system performs preliminary authentication of BIOS commands using encryption keys before allowing the controller to execute critical operations. This advance verification prevents malicious code from exploiting the controller's powerful functions.
Solution Approach 2:
The patent applies different security levels to different controller operations. Critical functions require authenticated BIOS commands with encryption verification, while less sensitive operations may have different access requirements, creating localized security zones within the controller.
3Productivity
If the system uses a shared register for communication between the CPU and controller, then the communication efficiency is improved, but the vulnerability to unauthorized command injection increases
Solution Approach 1:
The encryption key acts as an intermediary verification mechanism for commands passed through the shared register. Even though the register remains open for efficient communication, the key-based authentication filters out unauthorized commands, preventing injection attacks while maintaining communication speed.
4Speed
If the controller is given direct access to nonvolatile memory for storing encryption keys, then the access speed is improved, but the security risk of key exposure increases
Solution Approach 1:
The encryption keys are pre-loaded into the controller's nonvolatile memory in an encrypted or protected state during system initialization. This preliminary secure loading allows fast access during operation while maintaining security through the use of protected storage mechanisms established before normal operation begins.
Data Source
AI summary
A system and method for BIOS and controller communication is provided herein. The system may include an information handling system that includes a central processing unit coupled to a memory. The memory may contain a basic input/output system (BIOS). The information handling systems may also include a controller coupled to a nonvolatile memory and a register coupled to the central processing unit and the controller. The controller may be operable to store a key in the nonvolatile memory; write the key to the register in response to a signal from the BIOS; receive a command from the BIOS; verify the command is from the BIOS using the key; and execute the command if the command is from the BIOS.