Tampering Detection on Digital Evidence for Forensics Purposes

Main Article Content

Héctor Duvan Ortiz http://orcid.org/0000-0001-7299-4700
Diego Renza http://orcid.org/0000-0001-8073-3594
Dora M. Ballesteros L. http://orcid.org/0000-0003-3864-818X

Keywords

Watermarking, fragile watermarking, digital forensics, tampering detection, Collatz conjecture

Abstract

In terms of digital evidence, images of a crime scene play an important role in a legal process; therefore it is essential to guarantee their chain of custody. If the image is tampered with operations such as cropping, duplicity or blurring of objects, there must be a mechanism that identifies the existence of such manipulation. In this project, a solution to the chain of custody based on a technique known as watermarking is proposed. In order to validate the sensitivity and effectiveness of the proposed system, six classes of manipulations are applied to watermarked images; finding a high sensitivity to small manipulations (e.g 0.25% of the image size), since in all cases the manipulation was identified. With the proposed solution, legal authority can rely on the chain of custody of the digital evidence. 

Downloads

Download data is not yet available.
Abstract 190 | PDF (Español) Downloads 162