Set Top Box Conditional Access Applet Management
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Solution Overview
Problem
Cable and satellite television set top boxes are typically configured to decrypt signals from a single provider and cannot decrypt channels from other providers, requiring users to obtain a new set top box when switching service providers.
Innovation Solution
A secure processing system within the set top box that includes a central processing unit and data storage device, capable of receiving authorization and control messages to manage conditional access applets, allowing decryption of channels from multiple providers by switching between applets based on service provider identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a set top box is configured to decrypt signals from a single provider, then security and reliability are improved, but adaptability deteriorates
Solution Approach 1:
The patent implements a universal set top box that can decrypt signals from multiple service providers by incorporating multiple conditional access modules, each associated with a different service provider. The system dynamically selects and activates the appropriate module based on the received signal source, enabling one device to perform the function of multiple provider-specific devices while maintaining secure decryption capabilities for each provider.
Solution Approach 2:
The conditional access system is segmented into multiple independent modules, with each module dedicated to a specific service provider. This segmentation allows the system to maintain provider-specific security parameters and decryption algorithms separately while integrating them within a single unified device architecture.
2Adaptability or versatility
If multiple set top boxes are provided for different service providers, then service provider compatibility is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple provider-specific conditional access modules into a single integrated set top box. The system combines the functionality of what would traditionally require separate devices into one unified platform, reducing overall system complexity for the user while maintaining the ability to handle multiple service providers through intelligent module selection and management.
3Adaptability or versatility
If a unified set top box supports multiple providers, then adaptability is improved, but security risks increase
Solution Approach 1:
The system segments the conditional access functionality into isolated modules, each with its own security parameters and decryption algorithms. This segmentation prevents cross-contamination of security vulnerabilities between different service provider modules while maintaining the ability to support multiple providers within the same device.
Solution Approach 2:
Each conditional access module is configured with local quality parameters specific to its associated service provider, including provider-specific encryption keys and authentication mechanisms. This localized configuration ensures that security measures are optimized for each provider while maintaining overall system security through modular isolation.
Data Source
AI summary
A system and method are provided for decrypting a selected program. The system and method can receive at least one authorization message and at least one control message associated with a selected program. The system and method stores the at least one authorization message. The system and method transmits a first control signal if the at least one control message specifies a type of program that can be decrypted given the at least one authorization message and transmits a second control signal if the at least one control message specifies a type of program that can not be decrypted by the decryption device given the at least one authorization message.