Resumo

ORTIZ, Héctor Duvan; RENZA, Diego  e  BALLESTEROS L, Dora M. Tampering Detection on Digital Evidence for Forensics Purposes. ing.cienc. [online]. 2018, vol.14, n.27, pp.53-74. ISSN 1794-9165.  https://doi.org/10.17230/ingciencia.14.27.3.

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.

Palavras-chave : Watermarking; fragile watermarking; digital forensics; tampering detection; Collatz conjecture.

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