%% You should probably cite rfc6786 instead of this I-D.
@techreport{yegin-pana-encr-avp-02,
    number =    {draft-yegin-pana-encr-avp-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-yegin-pana-encr-avp/02/},
    author =    {Alper E. Yegin and Robert Cragie},
    title =     {{Encrypting PANA AVPs}},
    pagetotal = 9,
    year =      2012,
    month =     apr,
    day =       10,
    abstract =  {This document specifies a mechanism for delivering PANA (Protocol for Carrying Authentication for Network Access) AVPs (Attribute-Value Pairs) in encrypted form.},
}