Set-Top Box Security Processor Access Control Matrix Segmentation
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Solution Overview
Problem
Conventional access control mechanisms in multimedia systems, such as set-top boxes, face challenges with large memory requirements, complexity in managing access rights, and potential security conflicts due to the size of access control matrices, especially when dealing with numerous user modes and security components.
Innovation Solution
Implementing a security policy and enforcement mechanism that uses a hierarchical security layer structure and access control lists, where a default mode of operation complements the access control matrix to manage access rights efficiently and ensure security, allowing for flexible operation across various user modes and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-dimensional access control matrix is used to manage security rights for multiple users and security components, then comprehensive access control coverage is achieved, but memory requirements and system complexity increase significantly
Solution Approach 1:
The patent segments the two-dimensional access control matrix into multiple one-dimensional access control lists. Each list corresponds to a specific security component and contains access rights for multiple users. This segmentation reduces memory requirements by avoiding the need to store a complete N×M matrix when N and M are large, while still providing comprehensive access control coverage through the collection of segmented lists.
2Adaptability or versatility
If the access control matrix is expanded to support more user modes and security components, then system versatility is improved, but management complexity and security conflict risks increase
Solution Approach 1:
By dividing the access control matrix into multiple one-dimensional lists, each managing a specific security component, the system can easily add new user modes and security components without increasing overall management complexity. New components simply require adding a new list, and new users require adding entries to existing lists, maintaining low complexity while improving versatility.
Solution Approach 2:
The patent transforms the two-dimensional access control matrix into multiple one-dimensional access control lists, effectively changing the dimensional organization from a single N×M matrix to multiple 1×M lists. This dimensional transformation simplifies the data structure and management operations while maintaining the ability to support diverse user modes and security components.
3Productivity
If concurrent operation of multiple user modes is allowed, then system productivity is improved, but security conflicts may arise between user modes
Solution Approach 1:
The segmentation of access rights into component-specific lists allows the system to manage concurrent user mode operations more effectively. Each list can independently enforce access control for its associated security component, preventing conflicts by ensuring that each user mode's rights are clearly defined and enforced at the component level rather than requiring complex matrix-based conflict resolution.
Data Source
AI summary
In multimedia systems that implement secure access techniques, a method and apparatus for a security policy and enforcing mechanism for a set-top box security processor are provided. A security policy may be determined for a multimedia terminal based on high-level requirements by various system users. A default mode of operation may be generated based on the security policy and may be stored in a security policy memory. An access control matrix that indicates the operation of security components in a security processor for various user modes may be stored in the security policy memory. Control and/or access operations not supported by the access control matrix may be supported by the default mode of operation. The user modes in the access control matrix may include composition user modes. Accessing the information in the security policy memory may be utilized to enforce the security policy in the multimedia terminal.