Secure ad hoc networks [Message from the Editor-in-Chief]

This issue consists of two special topic sections and two articles accepted from open call. The first special topic section focuses on Security in Ad Hoc and Sensor Networks, and includes five articles. The second special topic section focuses on Wireless Sensor Networking and includes five articles. The two articles accepted from open call submissions both are related to session continuity during handoffs in heterogeneous mobile networks.