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 e...

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Autores:
Duvan Ortiz, Héctor
Renza. Diego
Ballesteros L., Dora M.
Tipo de recurso:
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
Rights
License
Copyright (c) 2018 Héctor Duvan Ortiz, Diego Renza, Dora M. Ballesteros L.
Description
Summary: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.