Digital Media Integrity Signaling With Secure Hashes
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Solution Overview
Problem
Existing video coding standards lack mechanisms to verify if an image or video is from a certified source, has not been tampered with, or is losslessly encoded, and the current decoded picture hash SEI message is not secure enough.
Innovation Solution
Implement secure hash functions like SHA-2 or SHA-3, along with digital signatures, to signal integrity and source verification, and use trusted timestamping to ensure the authenticity and integrity of image, audio, or video segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing video coding standards are used, then video compression is achieved, but integrity verification capability is lacking
Solution Approach 1:
The patent segments the media content into discrete units (media segments) and processes them individually through encoding and integrity verification. Each segment can be verified independently using hash functions, allowing the system to maintain complexity management while achieving comprehensive integrity coverage across the entire media stream.
Solution Approach 2:
The patent introduces verification information as an intermediary element between the media content and the verification process. This includes hash values, digital signatures, and timestamps that mediate the trust relationship between the encoded media and the verification system, enabling integrity verification without fundamentally altering the core video coding mechanisms.
2Reliability
If current decoded picture hash SEI message is used, then basic integrity checking is provided, but security is insufficient
Solution Approach 1:
The patent enhances the verification mechanism by changing the cryptographic parameters from basic hash functions to more secure algorithms. It introduces digital signatures with public key infrastructure, stronger hash functions, and timestamping mechanisms that fundamentally improve the security level while maintaining the same basic integrity verification function.
Solution Approach 2:
The patent performs preliminary cryptographic operations during the encoding stage, where hash values and digital signatures are computed and embedded into the bitstream before transmission. This preliminary action ensures that integrity verification can be performed efficiently during playback without requiring complex real-time processing, while also preventing tampering before it occurs.
3Reliability
If verification information is added to bitstream, then integrity indication is provided, but bandwidth consumption increases
Solution Approach 1:
The patent applies partial verification by providing integrity information only for specific media segments or critical portions of the content rather than the entire stream. This selective verification approach reduces the total amount of verification data embedded in the bitstream while maintaining sufficient security coverage for the most important content elements.
Solution Approach 2:
The patent uses efficient copying mechanisms where verification information is derived from and embedded alongside the media data in a compressed manner. Hash values and signatures are calculated based on the media content and embedded as compact representations, avoiding redundant data transmission while ensuring verifiability.
Data Source
AI summary
A method of digital media processing includes performing a conversion between a media segment and a bitstream of the media segment. The conversion conforming to a format rule and an encryption rule. The format rule specifying that verification information, which includes an indication of an integrity of a portion of the media segment, is signaled in the bitstream.