Video Stream Trustworthiness Check Using Hash and Digital Signatures
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Solution Overview
Problem
Existing video coding standards lack a method for standard compliant decoders to verify whether 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 reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the video data stream into multiple segments or blocks, each equipped with its own digital signature. This segmentation allows the verification process to be distributed and managed in manageable units, reducing the complexity burden on any single processing point while maintaining comprehensive trustworthiness verification across the entire stream.
Solution Approach 2:
The patent introduces hash values as intermediary elements between the video data and digital signatures. The hash function creates a compact representation of the data that can be efficiently verified, acting as a mediator that simplifies the verification process and reduces computational complexity while maintaining security.
2Reliability
If hash functions and digital signatures are applied to video data streams, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for verification - specifically, hash values and digital signatures - from the video data stream. By taking out only these critical verification elements rather than embedding comprehensive authentication data throughout the stream, the patent minimizes signaling overhead while maintaining verification capability.
Solution Approach 2:
The patent employs hash functions that transform the video data into fixed-length hash values, changing the parameter space from the original video data to a compact hash representation. This parameter transformation significantly reduces the amount of data that needs to be transmitted and stored for verification purposes.
3Reliability
If standard compliant decoders are made capable of verifying trustworthiness, then reliability is improved, but ease of operation decreases
Solution Approach 1:
The patent designs the verification mechanism to be universally applicable across different video data streams and decoding scenarios. By creating a universal verification framework that integrates with existing standard compliant decoders, the system enables trustworthiness checking without requiring separate specialized operations, thereby maintaining ease of operation.
Solution Approach 2:
The patent implements a self-service verification mechanism where the decoder automatically performs trustworthiness checks using built-in hash and signature verification capabilities. The system serves itself by automatically verifying authentication without requiring external intervention or complex user-side operations, maintaining simplicity while improving reliability.
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.