Command Control Data Segmentation in Video Packet Headers
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Solution Overview
Problem
Current video systems face challenges in securely transmitting and managing command and control (C&C) data within multiplexed video streams, particularly due to vulnerabilities in descrambling algorithms and the risk of piracy associated with shared control words, which can lead to interruptions in A/V data transmission and increased costs for hardware updates.
Innovation Solution
The method involves segmenting C&C data into portions with flags indicating their status (first, middle, last, or null) and inserting these portions into A/V packet headers, ensuring a guaranteed transmission channel for C&C data without interrupting A/V data flow, even in saturated conditions, and allowing for secure processing and reassembly at the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If C&C data is transmitted in separate packets from A/V data, then security and control are improved, but transmission reliability and continuity are worsened due to interruptions and saturation issues
Solution Approach 1:
The patent combines C&C data and A/V data into a single multiplexed transport stream, where C&C data is embedded within the same stream as A/V packets. This merging eliminates the need for separate transmission channels, ensuring that both data types are transmitted together without interruptions, thereby improving transmission reliability while reducing system complexity.
2Productivity
If C&C data is embedded in A/V packet headers, then transmission efficiency is improved, but data security is worsened due to potential exposure
Solution Approach 1:
The patent segments C&C data into multiple portions and distributes them across different A/V packet headers. Each packet header contains only a fragment of the complete C&C data, making it useless for piracy purposes unless all segments are collected and reassembled. This segmentation approach maintains transmission efficiency while significantly reducing security risks.
Solution Approach 2:
The patent introduces an intermediary processing step where C&C data is encrypted and then segmented before being embedded in packet headers. The encryption acts as an intermediary layer that protects the underlying C&C data, allowing efficient transmission while maintaining security against piracy attempts.
3Reliability
If separate C&C packet streams are used, then security is improved, but transmission continuity is worsened under saturated conditions
Solution Approach 1:
By merging C&C data into the A/V transport stream, the patent ensures that C&C data inherits the continuous transmission characteristics of the A/V stream. Since A/V streams are typically maintained continuously for playback purposes, embedding C&C data within them guarantees transmission continuity and eliminates interruptions that occur with separate packet streams under saturated network conditions.
4Device complexity
If C&C data is transmitted independently, then security control is improved, but system complexity increases due to multiple transmission channels
Solution Approach 1:
The patent merges C&C data transmission with the existing A/V transport infrastructure, eliminating the need for separate transmission channel management. This consolidation reduces system complexity by utilizing the already-established A/V stream pathways, while simultaneously improving data delivery assurance through the continuous and reliable nature of the multiplexed stream.
Data Source
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AI summary
The present disclosure relates to systems and methods for assembling and extracting command and control data. In embodiments of the present disclosure, the command and control data is segmented and inserted into multiple packet headers. The header packets are identified by flags such as "First portion," "Middle portion," "Last portion," or "Null Byte." When a receiver extracts the command and control data from the headers, it tracks the flags associated with the headers. The command and control data is saved to buffer in association with its associated flag. The receiver uses the flags to determine when all command and control data headers have been received. The command and control data is then reconstructed and used to decrypt audio visual content.