%% You should probably cite rfc7906 instead of this I-D.
@techreport{turner-km-attributes-00,
    number =    {draft-turner-km-attributes-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-turner-km-attributes/00/},
    author =    {Paul Timmel and Russ Housley and Sean Turner},
    title =     {{NSA's Cryptographic Message Syntax (CMS) Key Management Attributes}},
    pagetotal = 62,
    year =      2013,
    month =     jun,
    day =       4,
    abstract =  {This document defines key management attributes used by the National Security Agency. The attributes can appear in asymmetric and/or symmetric key packages as well as the Cryptographic Message Syntax (CMS) content types that subsequently envelope the key packages.},
}