@article{Chaum1981,
  author =	 {David L. Chaum},
  title =	 {{Untraceable electronic mail, return addresses, and
                  digital pseudonyms}},
  journal =	 {Communications of the {ACM}},
  volume =	 {24},
  number =	 {2},
  year =	 {1981},
  pages =	 {84--90},
  publisher =	 {ACM Press},
}

@article{Diffie1976,
  author =	 "Whitfield Diffie and Martin E. Hellman",
  title =	 {{New Directions in Cryptography}},
  journal =	 "IEEE Transactions on Information Theory",
  volume =	 "IT-22",
  number =	 "6",
  pages =	 "644--654",
  month =	 nov,
  year =	 "1976"
}