Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

FP6

INFONET-DH Résumé de rapport

Project ID: 22276
Financé au titre de: FP6-MOBILITY
Pays: Israel

Final Activity and Management Report Summary - INFONET-DH (Applications of Multiuser Information Theory to Data Hiding)

The basis of this research project lies in the intersection between multiuser information theory and information hiding. Due to the dramatic increase in the use of digital data, its availability in the Internet and the ease at which data can be copied and stored, there is increased interest in data hiding schemes in their various applications, as reflected in the growing number of papers describing watermarking schemes and the emerging standards for practical systems. Watermarking is a form of hiding information in a host data set (covertext), usually an image, audio signal, or video. There is a variety of applications for data hiding, ranging from classical steganography, provision of copyright protection, data authentication and copy control information.

Understanding multiuser Information Theory has remained the holy grail of information theory: Even the simplest settings have largely uncharacterized capacity regions. Multiuser information theory concerns analysis of efficient and reliable communication in multi-terminal settings. This field has recently attracted renewed attention because of key developments, both on the technological and theoretical levels that have given rise to a rich set of challenging research problems. The research is aimed at achieving a better understanding of the underlying multiuser-information theoretic problems with application to Information Hiding systems and their solutions, and analysing communication scenarios having elements such as side information pertaining to information hiding. A thorough understanding of the information hiding problem as communication with side information sheds new insight on the design of Watermarking schemes.

In our work, information hiding systems are characterized as communication systems, in which the information hider takes the role of the transmitter, the cover text serves as side information and the attacker, who may try to destroy the watermarked data, is modelled as communication channel. In particular, this project explores various information-theoretic aspects of communication scenarios, such as characterizing the amount of information that can be transmitted reliably over various channels, and analysing the probability of error in detecting the hidden message. Among the setups we consider are multi-user channels where the users can cooperate and exploit side information, general channels (not necessarily memory-less) that can model the arbitrary nature of the operation of an information hider, interference channels with side information, an extended notion of decoding a message which allows the decoder to declare of a failure (erasure option), and channels with secrecy, where the set messages are to be kept as secretive as possible from one of the receivers.

Our research provides better understanding of the related information hiding systems, and yields fundamental limits for the performance of information communication scenarios. We also provide insight for the design of such systems. The results of this project were published in 14 papers which appeared in peer-reviewed journals and conferences.

Contact

Shlomo SHAMAI
Tél.: +972-4-8294713
Fax: +972-4-8323041
E-mail