This book constitutes the refereed proceedings of the Fourth International Conference on Mathematical Methods, Models, and Architectures for Computer Network Security, MMM-ACNS 2007, held in St. Petersburg, Russia in September 2007. The First, Second and Third International Workshops - Mathematical Methods, Models and Architectures for Computer Networks Security - demonstrated the high interest of the international scientific community to the theoretical aspects of the computer network and information security and the need for conducting of such workshops as on-going series.
The proposed MMM-ACNS 2007 conference is intended as a next step in this series and will be focused on theoretical problems in the area under consideration. Its objectives are to bring together leading researchers from academia and governmental organizations as well as practitioners in the area of computer networks and information security, facilitating personal interactions and discussions on various aspects of information technologies in conjunction with computer network and information security problems arising in large-scale computer networks engaged in information storing, transmitting, and processing.
