Media Stream Trustworthiness Checks with Selective Hashing
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Solution Overview
Problem
Existing video and audio content standards lack methods to verify the trustworthiness of media data streams, particularly against deep-fake manipulations, which can lead to copyright infringements and trust issues.
Innovation Solution
Implement a hash function to derive a hash value from a predetermined portion of the media data stream, compute a digital signature based on this hash value, and insert it into the stream to verify trustworthiness, ensuring compatibility with existing standards and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital signature is inserted into the media data stream to verify trustworthiness, then the reliability of the media data stream is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only a predetermined portion of the media data stream for hashing and signature verification, rather than processing the entire stream. This selective extraction reduces the amount of data that needs to be signed and transmitted, thereby reducing signaling overhead while maintaining verification reliability.
Solution Approach 2:
The patent changes the parameter of data size by applying a hash function to transform the predetermined portion of the media data stream into a condensed hash value. This parameter transformation reduces the digital signature size from potentially large original data to a compact hash representation, resolving the contradiction between reliability and signaling overhead.
2Reliability
If a hash function is applied to the entire media data stream to ensure complete verification, then the reliability is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the media data stream by selecting only a predetermined portion for hashing and verification, rather than processing the entire stream. This segmentation divides the verification task into manageable parts, reducing device complexity and processing overhead while maintaining adequate reliability through strategic selection of the portion to be verified.
Solution Approach 2:
The patent applies partial action by hashing only a predetermined portion of the media data stream rather than the complete stream. This partial verification approach balances reliability requirements with reduced processing complexity, achieving sufficient trustworthiness verification without the excessive computational burden of complete stream processing.
3Loss of information
If the digital signature size is reduced to lower signaling overhead, then the loss of information is reduced, but the measurement precision of verification may be compromised
Solution Approach 1:
The patent replaces the mechanical approach of using large digital signatures with a cryptographic hash function-based verification system. This substitution uses mathematical hashing algorithms to generate compact signature representations that maintain verification accuracy while dramatically reducing signature size and signaling overhead.
Solution Approach 2:
The patent changes the parameter of data representation by transforming the predetermined portion of the media stream through a hash function. This parameter transformation converts potentially large amounts of data into fixed-size hash values, achieving both reduced signature size and maintained verification precision through the mathematical properties of cryptographic hashing.
Data Source
AI summary
A method for checking a media data stream having a media stream encoded thereinto on trustworthiness comprises: subjecting a predetermined portion of the media data stream, or data derived therefrom, to a hash function to obtain a hash value; deriving a digital signature from the media data stream; and checking whether the hash value fits to the digital signature to determine whether the media data stream is trustworthy.