Set-Top Box Software Update Enforcement via Segmented CPU Architecture
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Solution Overview
Problem
Communication devices, such as Set-Top Boxes (STBs), face security vulnerabilities due to their increased connectivity to the Internet, allowing hackers to bypass code updates and access streamed content, leading to unauthorized use and resale of protected digital content.
Innovation Solution
Implementing a multi-stage encryption system where a security CPU verifies the code version of software on STBs by decrypting a rights portion and key portion within encrypted content streams, ensuring only authorized access to digital content and preventing hacking attempts by integrating secure memory and video processing circuitry to protect content during transcoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If STBs are connected to open networks like the Internet to enable applications, then versatility and functionality are improved, but security vulnerability increases allowing hackers to bypass code updates and access protected content
Solution Approach 1:
The patent divides the STB system into two separate CPU architectures: a secure CPU that handles content protection and code verification, and a central CPU that provides general application functionality. This segmentation isolates security-critical functions from the vulnerable network-connected components, allowing the STB to access open networks while maintaining security through architectural separation.
Solution Approach 2:
The patent introduces a secure CPU as an intermediary between the network-connected central CPU and the content protection system. This intermediary verifies code versions and enforces security policies, acting as a mediator that allows application functionality while blocking unauthorized access attempts, thus resolving the contradiction between versatility and security.
2Adaptability or versatility
If code updates are made accessible to central CPU for application functionality, then system adaptability is improved, but code security deteriorates allowing hackers to bypass updates and spoof software versions
Solution Approach 1:
The patent segments code storage and verification functions between two CPU types. The secure CPU stores and verifies code versions from secure memory, while the central CPU executes applications. This segmentation ensures that code updates remain secure (verified by secure CPU) while still enabling system adaptability through legitimate updates.
Solution Approach 2:
The patent implements preliminary verification of code versions by the secure CPU before allowing the central CPU to execute updated software. This preliminary action (verification) ensures that only authenticated code updates are applied, preventing hackers from bypassing updates or spoofing versions while maintaining the ability to legitimately update the system.
3Adaptability or versatility
If content is made accessible to central CPU for processing, then application functionality is improved, but content security deteriorates allowing unauthorized interception and resale
Solution Approach 1:
The patent segments content access rights between two CPU architectures. The secure CPU maintains exclusive access to protected content and control logic, while the central CPU receives limited access only when authorized by the secure CPU. This segmentation enables content processing applications while preventing unauthorized interception, as the central CPU cannot access content without secure CPU approval.
Solution Approach 2:
The secure CPU acts as an intermediary that controls and mediates all content access requests from the central CPU. It verifies authorization and manages content flow, enabling legitimate content processing applications while blocking unauthorized access attempts. This intermediary role resolves the contradiction by allowing controlled access for applications while preventing security breaches.
Data Source
AI summary
A Set Top Box (STB) or client computer includes a communication interface operable to receive digital messages and digital content, memory operable, and processing circuitry coupled to the communication interface and to the memory. The STB is operable to receive a digital message, extract a key portion from the digital message, extract a rights portion from the digital message, determine a code version based upon the rights portion, read a stored code version from the memory, and compare the code version to the stored code version to validate the software instructions. Upon an unfavorable comparison of the code version to the stored code version, initiates an error action that may include sending a message to a service provider device for software instruction reloading, rebooting, and/or disable decryption of the digital content. Extracting the rights portion from the digital message may include decrypting the key portion to produce a decrypted result and decrypting the rights portion using the decrypted result to produce the decrypted rights portion.