?url_ver=Z39.88-2004&rft_id=10.1109%2FICACTE.2010.5579819&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Z.&rft.au=Ahmad%2C+Z.&rft.aulast=Ahmad&rft.title=User+requirement+model+for+federated+identities+threats&rft.date=2010&rft.isbn=9781424465408&rft.genre=proceeding