[alex_stoddard]

https://en.wikipedia.org/wiki/Solitaire_(cipher)

  "The Solitaire cryptographic algorithm was designed by Bruce
  Schneier at the request of Neal Stephenson for use by field
  agents in his novel Cryptonomicon, enabling them to
  communicate securely without having to rely on electronics or
  having to carry incriminating tools, It was designed to be a
  manual cryptosystem calculated with an ordinary deck of
  playing cards. In Cryptonomicon, this algorithm was
  originally called Pontifex to hide the fact that it involved
  playing cards."