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At least 883 records · Page 49Linked to original sources
PubMed1996

Safety and security of information systems.

This paper discusses some of the similarities and differences between the attributes of safety and security. It places these attributes within the broader topic of dependability and tries to identify what aspects of safety and security are unique and which aspects may be viewed within the attributes of reliability and availability. The paper then suggests that, rather than analyse systems from the single perspective of safety or security, they should be analysed from the broader perspective of dependability.

Computer Security↗
PubMed2005

[Fraudulent use of digital radiographs: secret reality or fiction?].

Digital radiography has several advantages and has become an indispensable diagnostic tool for many dentists in daily practice. Once the digital captation appears on screen, the dental x-ray software allows image enhancement, to get a better vision and diagnosis. This image enhancement is acquired for example by adjusting the colour, density, sharpness, brightness or contrast. If the digital radiographs are exported, using various software packages created for graphic design and image manipulation, digital information can be altered, added or removed. Dental radiographs are easily duplicated, stored or spread in digital format. How can their authenticity be guaranteed, especially in insurance cases? Image enhancement features of digital radiography allow mishandling or potential abuse. Recently published studies illustrate the potential fraudulent use of digital radiography. In this article, some manipulated radiographic images are presented, to raise concerns about security, reliability and the potential for fraud.

Computer Security↗
PubMed2003

[Does the digital signature of the DICOM standard meet the requirements of German law?].

The DICOM standard offers the possibilities to generate electronic signatures, valid according to German laws. This enhances the reliability of the correlation between image and patient data. However, only so called qualified electronic signatures--conveniently issued by an accredited supplier--are permissible and not rejectable as evidence in German jurisdiction and are completely equivalent to the handwritten signatures. These qualified electronic signatures can be executed only by individuals, whereas the former are not applicable to technical apparatus like image generating modalities. In consequence, a modality is able to provide its pictures with a "common or advanced signature" solely. This limits the use of the digital signature of the DICOM standard for further applications, e.g. the verifiability within the teleradiology.

Algorithms↗
PubMed1996

The potential medico-legal implications of computed radiography.

Computed radiographic (CR) systems are available which allow dentists to obtain direct digital intra-oral images. These CR images, however, can be readily altered using image processing software. This paper demonstrates the potential medico-legal problems of image manipulation and calls for manufacturers of CR equipment to be pressed to explore methods of preventing such abuse.

Computer Security↗
PubMed2004

Dual domain watermarking for authentication and compression of cultural heritage images.

This paper proposes an approach for the combined image authentication and compression of color images by making use of a digital watermarking and data hiding framework. The digital watermark is comprised of two components: a soft-authenticator watermark for authentication and tamper assessment of the given image, and a chrominance watermark employed to improve the efficiency of compression. The multipurpose watermark is designed by exploiting the orthogonality of various domains used for authentication, color decomposition and watermark insertion. The approach is implemented as a DCT-DWT dual domain algorithm and is applied for the protection and compression of cultural heritage imagery. Analysis is provided to characterize the behavior of the scheme under ideal conditions. Simulations and comparisons of the proposed approach with state-of-the-art existing work demonstrate the potential of the overall scheme.

Algorithms↗