%% You should probably cite rfc3218 instead of this I-D.
@techreport{ietf-smime-pkcs1-01,
    number =    {draft-ietf-smime-pkcs1-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-smime-pkcs1/01/},
    author =    {Eric Rescorla},
    title =     {{Preventing the Million Message Attack on Cryptographic Message Syntax}},
    pagetotal = 7,
    year =      2001,
    month =     nov,
    day =       29,
    abstract =  {This memo describes a strategy for resisting the Million Message Attack. This memo provides information for the Internet community.},
}