@InProceedings{LiDuBoneh03,
  author =      {Ninghui Li and Wenliang Du and Dan Boneh},
  title =       {Oblivious Signature-based Envelope},
  booktitle =   {Proceedings of the 22nd Annual ACM Symposium on Principles of
                 Distributed Computing},
  pages =       {182--189},
  address =     {Boston, MA, USA},
  month =       {July 13--16},
  year =        2003
}