@InProceedings{liu06,
  author = {Xin Liu and Xiaowei Yang and David Wetherall and Thomas Anderson},
  title = {Efficient and Secure Source Authentication with Packet Passports},
  booktitle = {Proceedings of 2nd USENIX Steps to Reduce Unwanted Traffic on the Internet workshop ({SRUTI} 2006)},
  year = 2006
}