[cryptography] Improving the Solitaire Cipher by Bruce Schneier

Aaron Toponce aaron.toponce at gmail.com
Wed Aug 20 18:45:49 EDT 2014

On Wed, Aug 20, 2014 at 04:40:50PM -0600, Aaron Toponce wrote:
> Instead, it could be adjusted to:
>     4. Perform a count cut. Look at the bottom card. Convert it into a number
>     from 1 through 53. Count down from the top card that number. Perform a cut
>     on the deck after the card you counted down to, placing the cut above the
>     bottom joker.
> In other words, by taking the "count down cut" and placing them between the
> jokers, the distance between the jokers changes randomly on each round, but it
> also decreases our probability that the output card will be the same as the
> previous output card, if the top card is the same after two successive rounds.

Ah, a simple oversight: if both jokers are in the count down cut, then what? I
see the problem here, and that explains some oddities I was seeing with my
Python script.

Back to the drawing board.

. o .   o . o   . . o   o . .   . o .
. . o   . o o   o . o   . o o   . . o
o o o   . o .   . o o   o o .   o o o
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