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.