topics in RFID research that reflect some key directions in this active yet diverse research area.The first short paper, by the Guest Editors of this special issue Sheng et al. (2009), outlines some of the challenges and key research directions in the RFID area. Three articles in this special issue deal with security and privacy of RFID technology. The paper by Mitrokotsa et al., "Classifying RFID Attacks and Defenses" Mitrokotsa et al. (2009), provides a comprehensive overview of possible attacks that RFID networks may face. The authors categorize the weaknesses of the existing RFID communications, which could serve a foundation for better understanding of RFID attacks and defense against these attacks. The paper by Zuo, "Secure and Private Search Protocol for RFID Systems" Zuo (2009), proposes a set of protocols that enable an RFID reader to search for particular tags based on their identities or certain criteria. The third paper by Zhou et al., "A Lightweight Anti-Desynchronization RFID Authentication Protocol" Zhou et al. (2009), proposes a lightweight antidesynchronization RFID authentication protocol that prevents attackers from de-synchronizing the shared secret between an RFID tag and its back-end server.The next three articles focus on integration frameworks for RFID application development. The papers included in this special issue cover a wide range of topics and present some of the key directions in this vibrant and rapidly expanding area of research and development. We hope that the set of selected papers provides the community with a better understanding of the current directions and areas to focus in future, and inspires your own work.Acknowledgements We thank all the authors for considering this special issue as an outlet to publish their research results in the area of RFID. We also would like to thank the referees who provided very useful and thoughtful feedback to the authors. Finally, we express our gratitude to the Editors-in-Chief, Professor Rao and Professor Ramesh for their kind support, advice, and encouragements throughout the preparation of this special issue.