%% You should probably cite rfc7539 instead of this I-D.
@techreport{irtf-cfrg-chacha20-poly1305-10,
    number =    {draft-irtf-cfrg-chacha20-poly1305-10},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-irtf-cfrg-chacha20-poly1305/10/},
    author =    {Yoav Nir and Adam Langley},
    title =     {{ChaCha20 and Poly1305 for IETF Protocols}},
    pagetotal = 45,
    year =      2015,
    month =     feb,
    day =       20,
    abstract =  {This document defines the ChaCha20 stream cipher as well as the use of the Poly1305 authenticator, both as stand-alone algorithms and as a "combined mode", or Authenticated Encryption with Associated Data (AEAD) algorithm. This document does not introduce any new crypto, but is meant to serve as a stable reference and an implementation guide. It is a product of the Crypto Forum Research Group (CFRG).},
}