Video Frame Signature Verification for Sequence Integrity
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Solution Overview
Problem
Existing video image authentication technologies fail to detect frame removal or frame order changes in video images, which can lead to falsification, as they only verify signatures on a frame-by-frame basis without ensuring the integrity of the entire video sequence.
Innovation Solution
An information processing apparatus and method that generates and verifies electronic signatures for video images using public key cryptography, where identification information is assigned to time-blocks of frames, allowing detection of frame removal and order changes by including session IDs and frame position information in the signature generation and verification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic signatures are generated and verified for each frame using public key cryptography, then the authenticity of individual frames can be ensured, but frame removal or frame order changes cannot be detected
Solution Approach 1:
The video image is divided into multiple frames, and each frame is further divided into multiple blocks. Electronic signatures are generated for each block rather than the entire frame, enabling fine-grained authentication. This segmentation allows the system to track individual blocks through the video sequence, making it possible to detect frame removal or reordering since each block's position and identity are independently verified.
2Reliability
If digital data is compressed by hash function and encrypted by private key to generate digital signature, then falsification of digital data can be detected, but frame removal or frame order change cannot be detected
Solution Approach 1:
The patent adds a spatial dimension to the signature verification process by dividing frames into multiple blocks and generating signatures for each block independently. This block-level segmentation creates additional verification points throughout the video sequence, enabling detection of frame removal or reordering by checking whether blocks appear in the expected positions and sequences.
3Productivity
If signature verification is performed on a frame basis, then processing overhead is reduced, but authenticity of the entire video sequence cannot be ensured
Solution Approach 1:
By segmenting frames into smaller blocks and generating signatures for each block, the system creates multiple independent verification points. This increases processing overhead but ensures that any manipulation of the video sequence (frame removal, reordering) will be detected at one of the block-level verification points, thereby ensuring authenticity of the entire sequence.
Data Source
AI summary
There is provided an information processing apparatus and method and a program enabling to ensure authenticity of a video image. The information processing apparatus includes: a signature generation unit configured to generate a first signature for every frame, on the basis of identification information, the frame of a video image, and a first private key of public key cryptosystem, the identification information being assigned to a time-block including a plurality of the frames of the video image; a certificate generation unit configured to generate a certificate including the identification information; and an output unit configured to output the certificate, the video image, and the first signature. The present technology can be applied to a transcoder.