Any camera will do, as long as it’s attached to your body. Researchers say they can have computers examine body camera video footage and accurately identify a person wearing a body-mounted device in about four seconds, according to a recently released paper.

The authors of the study had their software look at biometric characteristics like height, stride length, and walking speed to find the identity of the person shooting the footage.

As they point out, this could have both positive and negative implications for civilians, law enforcement, and military personnel if they’re using body-mounted cameras.

(It’s important to note that this research paper, Egocentric Video Biometrics, was posted to the arXiv repository. As such, it’s not considered a final, peer-reviewed work.)

Using static, mounted cameras to match a person’s height and gait is a relatively common and well-researched vector for narrowing down the identity of people caught in videos.

The authors said that, to get an accurate read of the biometric data of the person wearing the body cam, the footage has to be from a camera secured to one point on a person’s body (handheld cameras don’t work), and it has to have at least four seconds of video of the camera-wearer walking.

Despite these restrictions, the two researchers from The Hebrew University in Jerusalem noted that once the necessary information had been gathered, “the identity of the user can be determined quite reliably from a few seconds of video."

“This is like a fingerprint," Shmuel Peleg, one of the paper’s authors,