Webcam Key-Frame Signing for Deepfake-Resistant Video Feeds
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Solution Overview
Problem
Existing video conferencing systems lack comprehensive protection against video stream tampering, particularly deep fake video feeds, which can compromise the authenticity and integrity of video content during critical activities.
Innovation Solution
A system that digitally signs key frames of a video feed using a unique private key-public key pair and verifies their authenticity at the receiving end, employing computer vision techniques to assess frame similarity and prevent unauthorized alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signatures are applied to all video frames, then security against tampering is improved, but computational overhead and processing time increase significantly
Solution Approach 1:
The patent segments the video stream into key frames and non-key frames, applying digital signatures only to key frames. This segmentation allows the system to maintain security while reducing computational overhead by processing only a subset of frames rather than all frames.
Solution Approach 2:
The patent implements partial action by signing only key frames rather than all video frames. This approach provides sufficient security coverage while significantly reducing the computational burden, as key frames occur less frequently than every frame in a video stream.
2Reliability
If digital signatures are applied to video frames, then protection against tampering is improved, but the complexity of the system increases
Solution Approach 1:
The system is segmented into distinct modules: key frame detection module, digital signing module, and verification module. This modular architecture reduces system complexity by separating concerns and allowing each module to be independently optimized and maintained.
Solution Approach 2:
The patent implements preliminary action by pre-generating key frames and pre-computing their digital signatures before transmission. This allows the receiving end to simply verify signatures without performing complex cryptographic operations, thereby reducing overall system complexity.
3Reliability
If all video frames are transmitted with authentication data, then security is improved, but bandwidth consumption increases
Solution Approach 1:
The patent segments authentication data transmission to include only key frames rather than all video frames. This reduces the quantity of authentication data transmitted while maintaining security, as key frames serve as reference points for verifying the integrity of subsequent non-key frames.
Solution Approach 2:
The system applies partial action by transmitting authentication data for only a subset of frames (key frames). This provides sufficient security coverage while significantly reducing bandwidth consumption compared to authenticating every frame in the video stream.
4Ease of operation
If vendor-provided video modification tools are allowed, then ease of operation is improved, but vulnerability to tampering increases
Solution Approach 1:
The patent implements feedback by verifying digital signatures of key frames after any video processing operations. This feedback mechanism allows legitimate modifications to proceed while detecting and preventing unauthorized tampering, thus reconciling ease of operation with security.
Solution Approach 2:
The system performs preliminary action by digitally signing key frames before they are subjected to vendor-provided modification tools. This pre-authentication ensures that even if modifications occur, the original authenticity can be verified, maintaining security while allowing operational flexibility.
Data Source
AI summary
Systems and methods for safeguarding the authenticity and integrity of a real-time video feed generated by a webcam. A video frame includes a sequence of frame images and key frames within the sequence. A method includes generating the video feed by the webcam at a first computing device, identifying a key frame [kf] in the video feed, digitally signing the key frame [kf] using a private key of a private key-public key pair, embedding the digitally signed key frame [kf] in the video feed, transmitting the video feed to second computing device, identifying the next key frame [kf+1] in the video feed, and determining a similarity value of the next key frame [kf+1] and the key frame [kf] to determine whether to digitally sign and embed the digitally signed key frame [kf+1] in the video feed.