Secure Initial Program Load via Signature Verification and Segmentation
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Solution Overview
Problem
Existing secure boot mechanisms in computing environments face challenges in ensuring the integrity and authenticity of binary code components during the initial program load, particularly in verifying signatures and maintaining flexibility in packaging, which is crucial for compliance with evolving security standards like Common Criteria certification.
Innovation Solution
A method for securely performing an initial program load (IPL) in a computing environment involves verifying signatures of binary code components, allowing them to be unordered, and using an information report block to facilitate secure IPL by checking pointers and setting indicators, ensuring that only verified signed components are loaded, thereby enhancing security and flexibility in component packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional secure boot mechanisms are used to verify signatures of binary code components, then security is improved, but device complexity increases due to rigid packaging requirements and specific ordering constraints
Solution Approach 1:
The binary code components are segmented into individual loadable units, each with its own signature verification. The system divides the boot process into discrete verification steps where each component can be independently validated, allowing flexible packaging without requiring a specific ordered structure.
Solution Approach 2:
The packaging structure is made dynamic by removing rigid ordering constraints. Components can be loaded in any order as long as signature verification succeeds, allowing the system to adapt to different packaging configurations without increasing complexity.
2Reliability
If rigid packaging with specific ordering constraints is imposed on binary code components, then signature verification reliability is improved, but ease of manufacture deteriorates due to difficulty in adding new components
Solution Approach 1:
Each binary code component is treated as an independent segment with its own signature. This segmentation allows new components to be added to the packaging without requiring reordering or restructuring of existing components, simplifying the manufacturing process while maintaining verification reliability.
Solution Approach 2:
The verification mechanism is designed to be universal, accepting any binary code component that presents a valid signature regardless of its position or order in the packaging. This universality enables easy addition of new components without modifying the verification process.
3Ease of manufacture
If unordered binary code components are allowed in the packaging, then ease of manufacture is improved by enabling flexible component addition, but device complexity increases due to additional verification mechanisms needed
Solution Approach 1:
Signature verification is performed as a preliminary action before loading each binary code component. This preliminary verification ensures that unordered components can be safely loaded without requiring complex runtime checks, as the authenticity is confirmed in advance during the packaging phase.
Solution Approach 2:
Each binary code component carries its own signature information, making it self-identifying and self-verifying. This self-service approach eliminates the need for external verification mechanisms to track or manage component ordering, reducing overall system complexity while enabling packaging flexibility.
Data Source
Figure 1A
Figure 1B
Figure 2A~2C
AI summary
An initial program load of a system component of a computing environment is performed. A determination is made as to whether one or more signatures of one or more signed binary code components relating to the system component are verified. Based on determining that the one or more signatures are verified, additional verification is performed. The additional verification includes obtaining a select binary code component of one or more binary code components relating to the system component and determining whether the select binary code component is a particular signed binary code component. Based on determining that the select binary code component is the particular signed binary code component, a check is performed. The initial program load is continued based on a successful check.