%% You should probably cite draft-ietf-tls-chacha20-poly1305 instead of this I-D.
@techreport{mavrogiannopoulos-chacha-tls-00,
    number =    {draft-mavrogiannopoulos-chacha-tls-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-mavrogiannopoulos-chacha-tls/00/},
    author =    {Nikos Mavrogiannopoulos and Joachim Strombergson and Simon Josefsson},
    title =     {{The ChaCha Stream Cipher for Transport Layer Security}},
    pagetotal = 11,
    year =      2013,
    month =     dec,
    day =       6,
    abstract =  {This document describe how the Chacha stream cipher can be used in the Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) protocols.},
}