Watermarking-based Authentication Research Articles

A watermarking-based authentication and recovery scheme for encrypted audio

A watermarking-based authentication and recovery scheme for encrypted audio

A watermarking-based authentication and image restoration in multimedia sensor networks

In this paper, we propose a novel watermarking-based secure image acquisition scheme for multimedia sensor networks (MSNs), which provides support for image authentication and restoration. In the proposed scheme, the sensor node groups image frames. Two successive frames compose the non-overlapping authentication and restoration group. The watermarking bits, which are the version of the down sampling image, are computed from the first image and reversibly embedded into the second image. The sink does the verification and restoration by reversible watermark. Compared to previous work, our approach can not only implement authentication but also improve image quality. Experimental results show that our scheme can achieve gains in terms of authentication and packet loss tolerance to improve the image quality.

Two security layers for hierarchical data aggregation in sensor networks

Due to resource restricted sensor nodes, it is important to minimise the amount of data transmission among sensor networks. To reduce the amount of sending data, an aggregation approach can be applied along the path from sensors to the sink. However, as sensor networks are often deployed in untrusted and even hostile environments, sensor nodes are prone to node compromise attacks. Hence, an end-to-end secure aggregation approach is required to ensure a healthy data reception. In this paper, we propose two layers for secure data aggregation in sensor networks. Firstly, we provide an end-to-end encryption scheme that supports operations over cypher-text. It is based on elliptic curve cryptography that exploits a smaller key size, allows the use of higher number of operations on cypher-texts and prevents the distinction between two identical texts from their cryptograms. Secondly, we propose a new watermarking-based authentication that enables sensor nodes to ensure the identity of other nodes they are communicating with. Our experiments show that our hybrid approach of secure data aggregation enhances the security, significantly reduces computation and communication overhead, and can be practically implemented in on-the-shelf sensor platforms.

Watermarking for multi-stage encoded image authentication

Multi-stage encoded images generally provide multiple resolutions that have advantages in image transmission and storage. Several image encoders such as JPEG, SPIHT, EZW, JPEG2000, etc. support multi-stage encoding. However, any one of multi-stage encoded images should also be authentic to ensure transmission security. In this paper, a watermarking-based authentication scheme for multi-stage encoded images is proposed. The image authentication message is extracted from the image content and then embedded into images according to the multi-stage encoding. The experimental results show the validity of the proposed multi-stage image authentication scheme. A malicious operation can be detected within a multi-stage encoded image in which any significant tampering can be detected in the earlier authentication stages and any slight tampering can be detected in the later authentication stages. Furthermore, the proposed scheme can distinguish acceptable operations from malicious manipulations and the positions of the tampered areas can be located.

SELF RECOVERY AUTHENTICATION OF IMAGES IN THE DWT DOMAIN

The interest for multimedia contents authentication has recently increased. In particular watermarking-based authentication schemes seem to be offering some advantages with respect to classical cryptography tools (e.g. real content authentication, localization of manipulations, storage format independence, transparency to common signal processing, etc.). In this paper a simple and secure self recovery authentication algorithm which hides an image digest into some DWT subbands of the to be authenticated image is presented. This technique has been designed for video surveillance and/or remote sensing applications. The main goal of this approach is to detect possible malevolent object manipulations undergone by the image (object replacing and/or deletion) by means of a self recovery processing. This valuable characteristic has to be maintained also when an image is processed through an usual and friendly transformation like JPEG compression. Particular care is given to make the scheme robust against innocuous manipulations, and secure against forgery attempts. Experimental results are presented that demonstrate the good performance of the proposed system.

Image authentication techniques for surveillance applications

In automatic video surveillance (VS) systems, the issue of authenticating the video content is of primary importance. Given the ease with which digital images and videos can be manipulated, practically they do not have any value as legal proof, if the possibility of authenticating their content is not provided. In this paper, the problem of authenticating video surveillance image sequences is considered. After an introduction motivating the need for a watermarking-based authentication of VS sequences, a brief survey of the main watermarking-based authentication techniques is presented and the requirements that an authentication algorithm should satisfy for VS applications, are discussed. A novel algorithm which is suitable for VS visual data authentication is also presented and the results obtained by applying it to test data are discussed.