%% You should probably cite draft-irtf-cfrg-spake2 instead of this I-D.
@techreport{ladd-spake2-01,
    number =    {draft-ladd-spake2-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ladd-spake2/01/},
    author =    {Watson Ladd},
    title =     {{SPAKE2, a PAKE}},
    pagetotal = 6,
    year =      2015,
    month =     jan,
    day =       12,
    abstract =  {This Internet-Draft describes SPAKE2, a secure, efficient password based key exchange protocol.},
}