A robust content based digital signature for image authentication

TLDR

The paper proposes a methodology for designing content‑based digital signatures to authenticate images and extends it to video sequences. The approach uses a continuous authenticity measure to build signature systems that tolerate lossy compression while blocking other manipulations, applied to both images and video. Experiments demonstrate that the signatures work for images and enable verification of unmanipulated video segments.

Abstract

A methodology for designing content based digital signatures which can be used to authenticate images is presented. A continuous measure of authenticity is presented which forms the basis of this methodology. Using this methodology signature systems can be designed which allow certain types of image modification (e.g. lossy compression) but which prevent other types of manipulation. Some experience with content based signatures is also presented. The idea of signature based authentication is extended to video, and a system to generate signatures for video sequences is presented. This signature also allows smaller segments of the secured video to be verified as unmanipulated.