%% You should probably cite draft-ietf-httpauth-digest instead of this I-D.
@techreport{ietf-httpauth-digest-update-02,
    number =    {draft-ietf-httpauth-digest-update-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-httpauth-digest-update/02/},
    author =    {Rifaat Shekh-Yusef and David Ahrens},
    title =     {{HTTP Digest Update}},
    pagetotal = 9,
    year =      2013,
    month =     jun,
    day =       30,
    abstract =  {This documents specifies extensions to the HTTP Digest Authentication mechanism to add support for new digest algorithms to the HTTP Digest Access Authentication scheme.},
}