%% You should probably cite draft-ietf-httpbis-message-signatures instead of this I-D.
@techreport{cavage-http-signatures-01,
    number =    {draft-cavage-http-signatures-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-cavage-http-signatures/01/},
    author =    {Mark Cavage and Manu Sporny},
    title =     {{HTTP Signatures}},
    pagetotal = 10,
    year =      2014,
    month =     feb,
    day =       1,
    abstract =  {When communicating over the Internet using the HTTP protocol, it is often desirable to be able to securely verify the sender of a message as well as ensure that the message was not tampered with during transit. This document describes a way to add origin authentication and message integrity to HTTP messages.},
}