@misc{Riv21a,
  author =       { Ronald L. Rivest },
  title =        { The {RSA} Public Key Cryptosystem },
  date =         { 2021-06-21 },
  OPTyear =      { 2021 },
  OPTmonth =     { June 21, },
  note =         { Churchill College Distinguished Lecture (Cambridge, UK) },
  urla =         { <a href="https://www.youtube.com/watch?v=v4qaxSKTVlA&t=2s">video</a> },
}