@misc{rfc2634,
    series =    {Request for Comments},
    number =    2634,
    howpublished =  {RFC 2634},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC2634},
    url =       {https://www.rfc-editor.org/info/rfc2634},
    author =    {Paul E. Hoffman},
    title =     {{Enhanced Security Services for S/MIME}},
    pagetotal = 58,
    year =      1999,
    month =     jun,
    abstract =  {This document describes four optional security service extensions for S/MIME. {[}STANDARDS-TRACK{]}},
}