Babak Sadeghiyan

This book mainly aims at detecting the origins of preferential scanning worm and reconstructing its spread path. Our goal was to obtain a probability distribution function for estimating the probability of infection for nodes when preferential scanning worm is propagating. An algorithm is also developed on the basis of this probability distribution to allow detection of worm origin and reconstruction of its propagation path. Our purpose is to employ a complementary method and Back-to-Origin modeling to perform post-mortem forensic analysis for the propagation of worm, using the gathered network data. This is carried out to overcome the weaknesses of the current approaches, especially their high storage demand and computational complexity.

This work presents recent developments in hashing algorithm design. Hashing is the process of creating a short digest (i.e., 64 bits) for a message of arbitrary length, for exam- ple 20 Mbytes. Hashing algorithms were first used for sear- ching records in databases; they are central for digital si- gnature applications and are used for authentication without secrecy. Covering all practical and theoretical issues related to the design of secure hashing algorithms the book is self contained; it includes an extensive bibliography on the topic.