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The Third International Conference on Security in Communication Networks 2002 (SCN 2002) was held in the Salone Morelli of the Civic Museum of Amal?, Italy, September 11-13, 2002. The conference takes place every three years (p- vious ones were held in 1996 and 1999 in Amal? too) and aims to bring together researchers in the ?eld of security in communication networks to foster coop- ation and the exchange of ideas. The main topics included all technical aspects of data security including: anonymity implementation, authentication, key distribution, block ciphers, - erating systems security,...

The 4th International Conference on Security in Communication Networks 2004 (SCN2004)washeldatthe"DioceseHall"oftheArchdioceseofAmal?-Cavade' Tirreni and the "Armorial Bearings Hall" of the Archbishop Palace in Amal?, Italy, on September 8-10, 2004. Previous conferences also took place in Amal? in 1996, 1999 and 2002. The conference aimed at bringing together researchers in the ?elds of cr- tography and security in communication networks to foster cooperation and the exchange of ideas. The main topics included all technical aspects of data security, including: anonymity, authentication,...

With rapid progress in Internet and digital imaging technology, there are more and more ways to easily create, publish, and distribute images. Considered the first book to focus on the relationship between digital imaging and privacy protection, Visual Cryptography and Secret Image Sharing is a complete introduction to novel security methods and sharing-control mechanisms used to protect against unauthorized data access and secure dissemination of sensitive information.

Image data protection and image-based authentication techniques offer efficient solutions for...