%% You should probably cite rfc5035 instead of this I-D.
@techreport{ietf-smime-escertid-06,
    number =    {draft-ietf-smime-escertid-06},
    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-escertid/06/},
    author =    {Jim Schaad},
    title =     {{Enhanced Security Services (ESS) Update: Adding CertID Algorithm Agility}},
    pagetotal = 17,
    year =      2007,
    month =     apr,
    day =       27,
    abstract =  {In the original Enhanced Security Services for S/MIME document (RFC 2634), a structure for cryptographically linking the certificate to be used in validation with the signature was introduced; this structure was hardwired to use SHA-1. This document allows for the structure to have algorithm agility and defines a new attribute for this purpose. {[}STANDARDS-TRACK{]}},
}