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Summary form only given. Security is a critical issue in multi-user wireless networks in which secure transmissions are becoming increasingly difficult to obtain in highly mobile and distributed environments. Interest in this area has exploded since 2000, motivated by the rise of wireless networking in general and by the increasing interest in large mobile networks with light infrastructure, which are extremely difficult to secure by traditional methods. The new research trend in this field exploits the wireless medium and the common information between two nodes to secure the wireless link. The goal of this talk is to discuss recent advances in the area of wireless physical layer security - from the theoretical, such as the analysis of the secrecy capacity of various channel models -to more practical interests such as the development of codes and other communication schemes that can provide security in real networks.