How would you do that ...

[Robert J. Hansen]

> Neal Stephenson's novel Cryptonomicon is excellent. I strongly
> recommend it to anyone who enjoys reading & is interested in crypto.
> Part of the plot involves a cipher that operates a bit like RC-4,
> permuting an array, but the array is a deck of cards.
> https://www.schneier.com/academic/solitaire/

Please don't.  Solitaire is not a particularly well-designed cipher, in 
either the human factors sense or in the cryptographic strength sense. 
Even Schneier himself says it's mostly of interest only as a curiosity 
and not for serious purposes.