%% You should probably cite rfc9347 instead of this I-D.
@techreport{ietf-ipsecme-iptfs-06,
    number =    {draft-ietf-ipsecme-iptfs-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-ipsecme-iptfs/06/},
    author =    {Christian Hopps},
    title =     {{IP-TFS: IP Traffic Flow Security Using Aggregation and Fragmentation}},
    pagetotal = 29,
    year =      2021,
    month =     jan,
    day =       19,
    abstract =  {This document describes a mechanism to enhance IPsec traffic flow security by adding traffic flow confidentiality to encrypted IP encapsulated traffic. Traffic flow confidentiality is provided by obscuring the size and frequency of IP traffic using a fixed-sized, constant-send-rate IPsec tunnel. The solution allows for congestion control as well as non-constant send-rate usage.},
}