D igital watermarking of multimedia content has become a very active research area over the last several years. A general framework for watermark embedding and detection/de-coding is presented here along with a review of some of the algorithms for different media types described in the literature. We highlight some of the differences based on application such as copyright protection, authentica...

In IEEE 802.11 networks, selfish stations can pursue a better quality of service (QoS) through selfish MAC-layer attacks. Such attacks are easy to perform, secure routing protocols do not prevent them, and their detection may be complex. Twohop relay topologies allow a new angle of attack: a selfish relay can tamper with either source traffic, transit traffic, or both. We consider the applicabi...

In this paper, we consider the problem of digital watermarking to ensure the credibility of multimedia. We specifically address the problem of fragile digital watermarking for the tamper proofing of still images. Applications of our problem include authentication for courtroom evidence, insurance claims, and journalistic photography. We present a novel fragile watermarking approach which embeds...

Medical image watermarking is a special branch of image watermarking. The main use of medical image watermarking is for authentication and tamper detection. In addition, it is used to insert the related electronic patient record (EPR) into the medical image. The objective of this paper is to conduct a research of medical image properties and applications. In addition, some of medical image wate...

Electronic publishing has gained importance with the widespread use of Internet. It involves transmission of digital data in bulk from one place to another. It brings various threats to the data in form of illegal copying, redistribution of copyright contents and forgery. Watermarking provides authentication and copyright protection to the multimedia contents over the Internet. This paper prese...

Tamper-resistant storage techniques provide varying degrees of authenticity and integrity for data. This paper surveys five implemented tamper-resistant storage systems that use encryption, cryptographic hashes, digital signatures and error-correction primitives to provide varying levels of data protection. Five key evaluation points for such systems are: (1) authenticity guarantees, (2) integr...

Tamper-proof devices are pretty powerful. They typically make security applications simpler (provided that the tamper-proof assumption is not violated). For application requiring privacy, we observe that some properties may become harder (if possible at all) to achieve when devices are maliciously used. We take the example of deniability, receiptfreeness, and anonymity. We formalize the trusted...

In this paper we present a fully anonymous (for payer and payee) electronic payment scheme for B2B transactions involving high amounts, without using tamper resistant devices, without pseudonyms, and preventing double spending. Schemes with detection of double spending at deposit are not well suited for high amount transactions (merchants and banks don’t want to assume potential high losses). O...

This paper proposes an image authentication scheme for mobile devices. The proposed scheme generates an image watermark by using discrete cosine transform (DCT) and hides the watermark in the spatial pixels for image authentication and tamper detection. The hiding operator used in this paper is very simple in a mobile environment allowing high-speed authentication using a low-power mobile devic...

Today’s applications are highly mobile; we download software from the Internet, machine executable code arrives attached to electronic mail, and Java applets increase the functionality and appearance of web pages. This movement has stirred a great deal of research in the area of mobile code security. The fact remains that a newly arrived program to a local host has the potential to inflict sign...