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@techreport{rfc2104hmac,
  author       = {<NAME> and <NAME> and <NAME>},
  title        = {HMAC: Keyed-Hashing for Message Authentication},
  howpublished = {Internet Requests for Comments},
  type         = {RFC},
  number       = {2104},
  year         = {1997},
  month        = {feb},
  issn         = {2070-1721},
  publisher    = {RFC Editor},
  institution  = {RFC Editor},
  url          = {http://www.rfc-editor.org/rfc/rfc2104.txt}
}