Basic security concepts / Sushil Jajodia and Ting Yu -- Access control policies and languages in open environments / S. De Capitani di Vimercati, S. Foresti, S. Jajodia and P. Samarati -- Trusted recovery / Meng Yu, Peng Liu, Wanyu Zang and Sushil Jajodia -- Access control policy models for XML / Michiharu Kudo and Naizhen Qi -- Optimizing tree pattern queries over secure XML databases / Hui Wang, Divesh Srivastava, Laks V. S. Lakshmanan, SungRan Cho and Sihem Amer-Yahia -- Rule-based policy specification / Grigoris Antoniou, Matteo Baldoni, Piero A. Bonatti, Wolfgang Nejdl and Daniel Olmedilla -- Automated trust negotiation in open systems / Adam J. Lee, Kent E. Seamons, Marianne Winslett and Ting Yu --Basic security concepts / Sushil Jajodia and Ting Yu -- Access control policies and languages in open environments / S. De Capitani di Vimercati, S. Foresti, S. Jajodia and P. Samarati -- Trusted recovery / Meng Yu, Peng Liu, Wanyu Zang and Sushil Jajodia -- Access control policy models for XML / Michiharu Kudo and Naizhen Qi -- Optimizing tree pattern queries over secure XML databases / Hui Wang, Divesh Srivastava, Laks V. S. Lakshmanan, SungRan Cho and Sihem Amer-Yahia -- Rule-based policy specification / Grigoris Antoniou, Matteo Baldoni, Piero A. Bonatti, Wolfgang Nejdl and Daniel Olmedilla -- Automated trust negotiation in open systems / Adam J. Lee, Kent E. Seamons, Marianne Winslett and Ting Yu --