In today’s society, where technology is ubiquitous, protecting ourselves with firewalls is as important as defending ourselves with firepower. The major difference is that the perpetrators of cybercrime are increasingly remote to the scene of their crime and that in some cases their victims may not even realize that a crime is taking place.

Cybercrime and Digital Forensics Investigation.- Global E-Security.- How to Find Exculpatory and Inculpatory Evidence Using a Circular Digital Forensics Process Model.- Identity Theft: A Study in Contact Centres.- A Reasoning Agent for Credit Card Fraud on the Internet Using the Event Calculus.- Trends in Smartcard Fraud.- Tracking Online Trails.- Evaluation of Tools for Protection of Interest against Hacking and Cracking.- Voice and Video over Internet Protocols Security.- Testing Dialog-Verification of SIP Phones with Single-Message Denial-of-Service Attacks.- Covert Channels in SIP for VoIP Signalling.- Secure Recognition of Voice-Less Commands Using Videos.- An Extended Secret Sharing Scheme for Color Images with Fixed Pixel Expansion.- Computer Security.- Experimental Results on Algebraic Analysis of Trivium and Tweaked Trivium.- Secure Repayable Storage System.- A Generalized Model of E-trading for GSR Fair Exchange Protocol.- Mobile-PKI Service Model for Ubiquitous Environment.- Supporting Security against SYN Flooding Attack in Distributed DoS Via Measuring IPFIX-Based Traffic.- Multisensor Message Exchange Mechanism.- Spam Filtering without Text Analysis.- Collaborative Approach to Network Behavior Analysis.- Making Concurrent Switching with Input-Output-Queued Switches Practical.- Security Architecture and Authorisations.- User Dynamics in Graphical Authentication Systems.- Improved Results on Algebraic Cryptanalysis of A5/2.- A Logic for Inclusion of Administrative Domains and Administrators in Multi-domain Authorization.- Quantum Key Distribution.- A Survey of User Authentication Based on Mouse Dynamics.- Decoding Algorithm of Low Density Parity Check Code.- LMIP/AAA: Local Authentication, Authorization and Accounting (AAA) Protocol for Mobile IP.- Secure Biometrically Based Authentication Protocol for a Public Network Environment.- Another Security Improvement over the Lin et al.’s E-voting Scheme.- IT Governance.- A Meta-process for Information Security Risk Management.- Security Issues in mGovernment.- Mobile Customer Relationship Management and Mobile Security.- E-Commerce and Security Governance in Developing Countries.- IT Governance Metrics, Measurements and Benchmarking.- Web Services Security – Implementation and Evaluation Issues.- LMIP/AAA: Local Authentication, Authorization and Accounting (AAA) Protocol for Mobile IP.

This book constitutes the refereed proceedings of the 4th International Conference on Global E-Security, ICGeS 2008, held in London, UK, in June 2008. The 36 revised full papers presented were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on cybercrime and digital forensics investigation, voice and video over internet protocols security, computer security, security architecture and authorisations, and IT governance.