VIDEO USERS MUST GUARD AGAINST TAMPERING CLAIMS, WARNS IDIS

17 Apr 2021

Proving integrity of footage to become increasingly important

Growing concern about deep-fake videos will make it increasingly important to be able to demonstrate the integrity of video evidence, warn South Korea’s largest in-country video tech manufacturer IDIS.

Rapid advances in digital video manipulation techniques, and a rise in alleged deep-fake celebrity videos being reported in the news, will put pressure on both video tech users and on prosecutors to demonstrate the integrity of any footage they use.

“As we look ahead, wherever video is presented for use as legal evidence, or as part of internal disciplinary proceedings, we will see more attempts to assert that footage is not genuine. Courts will dismiss evidence where tampering cannot be ruled out,” says Dr Peter Kim, Global Technical Consultant, IDIS.

“Any challenge to the integrity of video evidence, if not countered, risks undermining the value of the entire video solution. This is particularly true in applications where investigating and prosecuting wrongdoing is a key function of the camera system. So, it will be vital that users can demonstrate beyond doubt that their footage has not been tampered with in any way.”

IDIS, which supplies complete, end-to-end video solutions for applications ranging from high-risk critical infrastructure to commercial settings, has created protection of video footage integrity through its patented Chained Fingerprint™ algorithm.

IDIS recorders use Chained Fingerprint to ensure the integrity of the recorded and exported video data. Each frame is assigned a unique numerical ‘fingerprint’, calculated by relating its own pixel value to the fingerprint of the previous frame. This means that every single image frame of the video is linked by an encryption ‘chain’ with its neighbouring image frames. The encrypted chain is stored as part of the video data when the video is recorded or exported as a video clip using the IDIS ClipPlayer. Before playback, the ClipPlayer scans video and recalculates the fingerprint chains of the video data. If any part of the image frame is tampered with, the fingerprint chain will be broken and will not match the chain value calculated at the time of video export, prompting a flag.

“As organisations look to upgrade or invest in new video solutions, protecting themselves against claims of video evidence tampering should be high on their priority list,” adds Kim.

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