Reminds me of the playing-card based encryption system designed by Bruce Schneier for the novel Cryptonomicon . https://en.wikipedia.org/wiki/Solitaire_(cipher

Reminds me of the playing-card based encryption system designed by Bruce Schneier for the novel Cryptonomicon . https://en.wikipedia.org/wiki/Solitaire_(cipher) https://en.wikipedia.org/wiki/Solitaire_(cipher)