TV Broadcast Security Validation with Low-Overhead CI+CAM Feedback
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Solution Overview
Problem
Existing communication systems lack efficient methods for managing communications between broadcast receiving apparatus and external security modules, leading to data reliability issues and vulnerability to broadcast signal intrusion.
Innovation Solution
A security device and apparatus are introduced to validate data and manage communications, comprising a receiver, processor, and transmitter for determining and transmitting validation information between a receiving apparatus and a security device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TV transmits the entire multiplex to the CI+CAM for decryption, then the security service can be provided, but significant communication overhead is generated
Solution Approach 1:
The patent extracts only the necessary components (EPG data and validation information) from the entire multiplex signal and transmits them separately to the CI+CAM. This eliminates the overhead of transmitting the complete multiplex while maintaining the ability to provide security services for encrypted content.
Solution Approach 2:
The patent segments the communication into distinct parts: the TV transmits EPG data through the normal multiplex, and separately transmits validation information to the CI+CAM. This segmentation allows the security module to validate content without receiving the entire multiplex, reducing communication overhead.
2Reliability
If external security modules are installed to provide security services, then data protection is improved, but the system complexity increases
Solution Approach 1:
The patent introduces validation information as an intermediary element that enables the CI+CAM to independently verify content without requiring complex continuous communication with the TV. The validation information acts as a mediator that simplifies the interaction between the receiving apparatus and the external security module.
3Loss of energy
If validation information is transmitted separately from the multiplex, then communication overhead is reduced, but the difficulty of detecting and measuring validation data increases
Solution Approach 1:
The patent implements a feedback mechanism where the CI+CAM validates the EPG data using the received validation information and sends the validation result back to the TV. This feedback loop ensures that the separate transmission of validation information can be properly detected and verified, maintaining system reliability while reducing overhead.
Data Source
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AI summary
An apparatus and a method for providing a security service in a communication system are provided. The security device includes a receiver configured to receive validation information used for validating data received by a receiving apparatus from the receiving apparatus, at least one processor configured to determine whether the validation information matches set validation related information, and a transmitter configured to transmit information indicating the determined result to the receiving apparatus.