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Many organisations are transforming their businesses through the development of information and communications technologies. The security of this e-commerce is now a key enabler for businesses, and this book presents an overview of current and future infrastructures for e-business security. Coverage includes XML security mechanisms and next generation Public Key Infrastructures (PKIs), as well as digital archiving and wireless security, which is set to be a huge growth area with the full roll-out of 3G mobile networks. TETRA security, firewalls and Virtual Private Network (VPN) technologies are all discussed to provide business solutions for end-to-end secure networking. This book is essential reading for professionals, researchers and managers involved in the implementation of security in communications systems.