This book constitutes the thoroughly refereed post-proceedings of the Second European Workshop on Security and Privacy in Ad hoc and Sensor Networks, ESAS 2005, held in Visegrad, Hungary in July 2005, in conjunction with the First International Conference on Wireless Internet (WICON).

The 17 revised full papers were carefully reviewed and selected from a total of 51 submissions. The papers address current topics in network security, cryptography, and wireless networking communities and present original research on all aspects of security and privacy in wireless ad hoc and sensor networks.