@Article{LiDuBoneh05,
  author =      {Ninghui Li and Wenliang Du and Dan Boneh},
  title =       {Oblivious Signature-based Envelope},
  journal =     {Distributed Computing},
  pages =       {293--302},
  volume =      {17},
  number =      {4},
  year =        {2005}
}