Book excerpt: This innovative resource provides comprehensive coverage of the policies, practices, and guidelines needed to address the security issues related to today's wireless sensor networks, satellite services, mobile e-services, and inter-system roaming and interconnecting systems. It details the major mobile standards for securing mobile communications and examines architectures that can provide data confidentiality, authentication, integrity, and privacy in various wireless environments. The book defines the roles and responsibilities that network operators, service providers, and even customers need to fulfill to assure mobile communications are as secure as they are prolific.