MagicFern

This repository contains the native C++ implementation to camera noise extraction based on PRNU from images and determining the affiliation to other camera noise fingerprints using the Peak-to-correlation energy (PCE).
The code was used for our paper Camera Fingerprinting Authentication Revisited.

Paper

Camera Fingerprinting Authentication Revisited
D. Maier, H. Erb, P. Mullan and V. Haupert
The 23rd International Symposium on Research in Attacks, Intrusions and Defenses (RAID 2020)

If you find our work useful in your research please consider citing our paper:

@inproceedings {259727,  
author = {Dominik Maier and Henrik Erb and Patrick Mullan and Vincent Haupert},  
title = {Camera Fingerprinting Authentication Revisited},  
booktitle = {23rd International Symposium on Research in Attacks, Intrusions and Defenses ({RAID} 2020)},  
year = {2020},  
isbn = {978-1-939133-18-2},  
address = {San Sebastian},  
pages = {31--46},  
url = {https://www.usenix.org/conference/raid2020/presentation/maier},  
publisher = {{USENIX} Association},  
month = oct,  
}  

What is it?

This program is a C++ implementation of a digital fingerprint extraction from a camera sensor
and determines the Peak-correlation-to-correlation-ratio (PCE) detection statistic.
The code is based on a Matlab implementation from M. Goljan et. al.. More information about their
work is found here: http://dde.binghamton.edu/download/camera_fingerprint/

To work properly the program needs a stack of images of the same camera sensor. It is advisable
to use around 20 images for fingerprint determination.
With these, the camera fingerprint is determined. Then the fingerprint is compared with the noise
residual of a reference image. The program returns the Peak to Correlation energy, the false alarm
probability and the pvalue. For authentication purposes the PCE is sufficient. A value
above at least 60 can be considered as the same camera sensor.

Requirements

To get started, it is necessary to have OpenCV 3.1.0 preinstalled.

Usage - example

The arguments need to be file directories to the images,
which should be used for the Camera Identification.

Example:
MagicFern [-h] --references REFERENCES [REFERENCES ...] [--candidates
                              CANDIDATES [CANDIDATES ...]] [--crop CROP] [--valid-format]
                              [--save-reference]

Positional arguments:
--references REFERENCES [REFERENCES ...], -r REFERENCES [REFERENCES ...]
                              A list of images used to calculate the fingerprint.
                              Alternatively, one might also specify a single path
                              pointing to a YML file containing the reference finger-
                              print directly as an OpenCV matrix.

Optional arguments:
-h, --help shows this help message and exits

--candidates CANDIDATES [CANDIDATES ...], -c CANDIDATES [CANDIDATES ...]
                              A list of images, each used as a candidate for the
                              calculated fingerprint.

--crop CROP, -s CROP Number of pixel to use for a quadratic center crop of
                              the images. Defaults to the minimum size of the
                              smallest image.

--valid-format, -v Only determines PCE from candidates with the same size
                              like the reference images.

--save-reference, -o Path to save the reference image to. Needs to end with
                              ".yml", e.g., "referenceFingerprint.yml".

Contacts - Copyright

This code is for non-commercial use only.
For bug reports feel free to open an issue.