%% You should probably cite rfc7894 instead of this I-D.
@techreport{wallace-est-alt-challenge-06,
    number =    {draft-wallace-est-alt-challenge-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-wallace-est-alt-challenge/06/},
    author =    {Max Pritikin and Carl Wallace},
    title =     {{Alternative Challenge Password Attributes for Enrollment over Secure Transport}},
    pagetotal = 9,
    year =      2016,
    month =     mar,
    day =       17,
    abstract =  {This document defines a set of new Certificate Signing Request attributes for use with the Enrollment over Secure Transport (EST) protocol. These attributes provide disambiguation of the existing overloaded uses for the challengePassword attribute defined in PKCS (Public-Key Cryptography Standards) \#9 (RFC2985). Uses include the original certificate revocation password, common authentication password uses, and EST-defined linking of transport security identity.},
}