Video Integrity Verification With Tamper-Triggered Recording
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Solution Overview
Problem
Existing video data tampering detection technologies, such as those discussed in Japanese Patent Application Laid-Open No. 2017-41841, fail to protect untampered video data when tampering occurs.
Innovation Solution
A video transmission apparatus generates a unique encrypted digital signature based on a hash value of the video data and attaches it to the video data, while a video reception apparatus decrypts and verifies the signature to detect tampering, and upon detection, the client apparatus can request the imaging apparatus to stop video delivery, start video recording, or change the delivery method to prevent further tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video data tampering detection is implemented using digital signatures, then the ability to detect tampering is improved, but the protection of untampered video data is insufficient when tampering occurs
Solution Approach 1:
The patent applies preliminary action by having the imaging apparatus pre-record video data in storage before transmission. When tampering is detected at the reception apparatus, the pre-recorded untampered video data can be immediately provided as a replacement, ensuring continuous availability of authentic video content without waiting for retransmission.
Solution Approach 2:
The patent implements feedback by establishing a closed-loop system where the reception apparatus monitors video data integrity through digital signature verification, detects tampering, and sends control signals back to the imaging apparatus to trigger re-recording and re-transmission of untampered video data from storage.
2Reliability
If video data is transmitted with digital signature attachment, then tampering detection capability is enhanced, but system complexity increases
Solution Approach 1:
The patent uses digital signatures as an intermediary mechanism to verify video data integrity. The signature, attached to each video data packet, serves as a mediator that enables the reception apparatus to authenticate the data without requiring complex direct verification protocols between the imaging and reception apparatuses.
Solution Approach 2:
The imaging apparatus's storage function serves multiple purposes: it stores both recently transmitted video data and previously recorded video data as backup. This multi-functionality allows the system to handle both normal transmission and tampering recovery scenarios using the same storage infrastructure, reducing overall system complexity.
Data Source
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AI summary
A video reception apparatus configured to communicate with a video transmission apparatus includes a reception unit configured to receive video data via the communication, a determination unit configured to determine whether the received video data has been tampered with, and a transmission unit configured to transmit, to the video transmission apparatus, a command to start video data recording in a case where the received video data is determined to have been tampered with.