@phdthesis{de-5605,
  title = {Secure offline legitimation systems},
  author = {Gerrit Bleumer},
  year = {2004},
  url = {http://hdl.handle.net/2003/2563},
  note = {http://d-nb.info/1011532131},
  researchr = {https://researchr.org/publication/de-5605},
  cites = {0},
  citedby = {0},
  school = {Dortmund University of Technology},
}