Selective Encryption of Audio and Video Data in Video Recording
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Solution Overview
Problem
Conventional digital video broadcasting systems face security issues during video recording, as audio and video data can leak during transmission and storage due to the lack of secure handling in the rich execution environment.
Innovation Solution
A video recording apparatus and method that includes a demultiplexer to separate program, audio, and video data, a descrambler to descramble the data, a marker to mark the data, and an encryption processor in a trusted execution environment to encrypt only the audio and video data, while keeping program information unencrypted, ensuring secure storage in a rich execution environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all data (program information, audio data, video data) is encrypted and stored in the REE memory, then security is improved, but processing complexity and storage overhead increase
Solution Approach 1:
The patent segments data into two categories: sensitive data (audio and video) that requires encryption, and non-sensitive data (program information) that does not. This segmentation allows selective encryption of only the necessary portions, improving security for critical data while avoiding the complexity of encrypting all data. The marker mechanism further segments the data stream to identify which portions require encryption processing.
Solution Approach 2:
The patent applies different quality treatments to different parts of the data stream. Program information is kept in plaintext format for ease of processing, while audio and video data are encrypted for security. This local differentiation of data treatment optimizes the balance between security and processing efficiency by applying encryption only where necessary.
2Ease of operation
If software-based copy function is used in the TEE demultiplexer, then ease of operation is improved, but security deteriorates due to potential tampering and data leakage
Solution Approach 1:
The patent introduces a marker as an intermediary element that is inserted into the data stream between the TEE demultiplexer and the REE memory. This marker acts as a security checkpoint that identifies sensitive data portions without requiring the software copy function to handle the actual data. The marker mechanism allows the software to operate easily while maintaining security through the intermediary's verification function.
Solution Approach 2:
The patent replaces the software-based security verification mechanism with a hardware-based marker insertion and recognition mechanism. The marker is inserted by the TEE demultiplexer and recognized by the encryption processor, substituting the need for software-based copy control and security verification. This mechanical/hardware approach enhances security while maintaining ease of operation.
Data Source
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AI summary
This application discloses a video recording apparatus and a video recording method. The video recording apparatus includes a first demultiplexer, configured to: separate program information, audio data, and video data from a transport stream; a marker, configured to: mark the separated audio data and the separated video data, and transmit a mixed stream to an encryption processor, where the mixed stream includes the program information, the marked audio data, and the marked video data; and the encryption processor, configured to: identify the audio data and the video data in the mixed stream, encrypt the identified audio data and the identified video data to obtain encrypted audio data and encrypted video data, and transmit the encrypted audio data, the encrypted video data, and the program information to a memory in a rich execution environment REE for storage, so as to implement video recording.