@TECHREPORT{blac,
  author = {Patrick P. Tsang, Man Ho Au, Apu Kapadia  and Sean W. Smith},
  title = {Blacklistable Anonymous Credentials: Blocking Misbehaving Users without TTPs (Extended Version)},
  institution = {Department of Computer Science, Dartmouth College},
  year = {2007},
  number = {TR2007-603},
  month = {September},
  note = {This tech report is the extended version of the paper appeared in CCS '07 under the same title}
}