PRIVACY: Throwing up a peace sign is one of the most dangerous things you can do.

“Just by casually making a peace sign in front of a camera, fingerprints can become widely available,” Isao Echizen, a researcher from NII, told a local Japanese newspaper this week, PhysOrg reports. He also explained that if the lighting is right in a photo, even a smartphone camera could potentially capture enough fingerprint data to recreate a user’s biometric identity.

According to the story, countermeasures are already being developed.