Tampering Detection on Digital Evidence for Forensics Purposes

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 paper, 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.

• Autores: Duvan Ortiz, Héctor; Renza. Diego; Ballesteros L., Dora M.
• Fecha de publicación: 2018
• Institución: Universidad EAFIT
• Repositorio: Repositorio EAFIT
• Idioma: spa
• OAI Identifier: oai:repository.eafit.edu.co:10784/13191
• Acceso en línea: http://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/4818; http://hdl.handle.net/10784/13191
• Palabra clave: Watermarking; Fragile watermarking; Digital forensics; Tampering detection; Collatz conjecture; Marcado de agua; Marcado frágil; Multimedia forense; Detección de manipulaciones; Conjetura de Collatz
• License: Copyright (c) 2018 Héctor Duvan Ortiz, Diego Renza, Dora M. Ballesteros L.