Media type: E-Article Title: Guest Editors' Introduction Contributor: Bertino, Elisa; Ling, Tok Wang; Dayal, Umesh imprint: Springer Science and Business Media LLC, 2004 Published in: World Wide Web Language: English DOI: 10.1023/b:wwwj.0000015951.19202.98 ISSN: 1386-145X Keywords: Computer Networks and Communications ; Hardware and Architecture ; Software Origination: Footnote: