Video Stream Trust Verification With Embedded Digital Signatures
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Solution Overview
Problem
Existing video coding standards lack methods for standard compliant decoders to verify if a compressed bitstream was generated by a trustworthy source, making them vulnerable to deep-fakes and potential misuse.
Innovation Solution
Implement a trustworthiness check by encoding video data streams using block-based predictive coding and transform-based residual coding, applying context adaptive variable length coding, and inserting digital signatures based on hash values to ensure authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signatures are inserted into video data streams to ensure trustworthiness, then security and authenticity are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent divides the video data stream into multiple segments or blocks, and inserts digital signatures at specific segmentation points rather than throughout the entire stream. This allows trust verification at discrete locations, reducing the complexity of processing and integration while maintaining security.
Solution Approach 2:
The patent introduces an intermediary verification mechanism that separates the core video encoding function from the trust verification function. By using a dedicated verification module that operates independently, the system avoids embedding complex security logic within the video decoder/encoder, thus reducing overall device complexity.
2Reliability
If hash functions and digital signatures are applied to verify trustworthiness, then security against deep-fakes is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential cryptographic information (hash values and digital signatures) from the verification process and inserts them as compact metadata elements in the video stream. By taking out only the necessary security data rather than including all verification details, the signaling overhead is minimized while maintaining security effectiveness.
Solution Approach 2:
The patent employs parameter changes in the encoding process, such as using compressed hash representations or optimized signature formats, to reduce the amount of data required for verification. By changing the parameter representation of cryptographic data, the system achieves better security with lower signaling overhead.
3Reliability
If existing video coding standards are extended with trustworthiness verification, then security is improved, but ease of operation and compatibility may worsen
Solution Approach 1:
The patent designs the trustworthiness verification mechanism to be universally applicable across different video coding standards (H.264, H.265, H.266) by using standard-compliant syntax elements and metadata formats. This multi-functionality allows existing decoders to verify trustworthiness without requiring standard changes, maintaining compatibility while improving security.
Solution Approach 2:
The patent implements a self-service verification approach where the video data stream carries its own verification information (digital signatures and hash values) embedded within the encoding process. This allows any compliant decoder to independently verify trustworthiness using built-in functions, eliminating the need for external verification systems and simplifying operation.
Data Source
AI summary
A method for checking a video data stream having a video encoded thereinto on trustworthiness comprises: subjecting a predetermined portion of the video data stream, or data derived therefrom, to a hash function to obtain a hash value; deriving a digital signature from the video data stream; and checking whether the hash value fits to the digital signature to determine whether the video data stream is trustworthy.