%% You should probably cite draft-ietf-httpauth-digest instead of this I-D.
@techreport{ietf-httpauth-digest-encoding-02,
    number =    {draft-ietf-httpauth-digest-encoding-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-encoding/02/},
    author =    {Rifaat Shekh-Yusef},
    title =     {{An Encoding Mechanism for HTTP Digest Authentication}},
    pagetotal = 6,
    year =      2013,
    month =     jul,
    day =       7,
    abstract =  {RFC2617 does not define how to treat Unicode characters {[}UNICODE{]} outside the ASCII range {[}RFC20{]} with the "Digest" scheme. This document defines an extension to the "Digest" scheme, and a mechanism that enables the client and server to negotiate their support for the UTF-8 {[}RFC3629{]} character encoding scheme.},
}