Telecommunications networks are a critical component of the economic and social infrastructures in which we live. Each day, well over three billion people across the globe rely upon these systems, as their primary means of connecting to the world around them. Given the significant focus on securing critical infrastructure in recent years, "Security for Telecommunications Networks" creates a starting place for new researchers in the field of secure telecommunications networks. This volume not only discusses emerging threats, along with system vulnerability, but also presents the open questions posited by network evolution and defense mechanisms. This is one of the first books to discuss securing current and next generation telecommunications networks by the security community. "Security for Telecommunications Networks" is designed for a professional audience composed of practitioners and researchers in industry. This book is also suitable as a secondary text book or reference for advanced-level students in computer science and electrical engineering.