23 A Review of “Camera Attribution Forensic Analyzer in the Encrypted Domain”

This paper is a review of a work previously published by the authors at IEEE WIFS’18 (Workshop on Information Forensics and Security), which received the Best Paper Award, and contains a summary of its main results. In WIFS’18 we proposed a new framework for the secure outsourcing of the image source attribution problem, in which the Photoresponse Non-Uniformity (PRNU) is used as a fingerprint to decide whether a test image was taken with a specific camera device. This method is fully unattended, that is, the secret key owner does not take part during the process. To this aim, we introduced improvements on the state-of-the-art in secure and unattended solutions for denoising. We also showed how to homomorphically perform filtering, polynomial, denoising and pixel-wise operations in a single round without the need of an interactive protocol