[Cryptography] quantum computers & crypto

[John Levine]

It appears that Christian Huitema <huitema at huitema.net> said:
>> But if you do 52 perfect shuffles in a row you bring the deck back into
>> its original order.  No matter what (n) you use, it will never be 'more
>> secure' than some (n) less than 52.  The so-called 'perfect shuffle' is
>> actually fairly lousy considered as a randomization algorithm, but you
>> see the point.
>
>Really? Did you mean to write 52! perfect shuffles in a row?

No, he meant to write 8.  

Spiffy animation of 8 perfect shuffles here:

https://jdgmiles.github.io/Riffle-Shuffles/

R's,
John