Photographs can be manipulated or decontextualized to mislead or misrepresent. Existing techniques to authenticate the time or location of image capture, such as stamping a time on the image, are rather simplistic and vulnerable. This disclosure describes techniques to prove the time and place of capture of a photograph. An authenticity server generates a timestamped, pseudorandom pattern. Upon capture of a photograph, the camera downloads the pattern and captures an authentication video while executing a sequence of movements corresponding to the pattern. The authentication video can be used to authenticate the time of capture of the photograph by confirming that the camera moved in accordance with the timestamped, pseudorandom pattern.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.