At 22:09 -0500 2006/03/22, John Denker wrote:
Aram Perez wrote:
* Can you add or increase entropy?
Shuffling a deck of cards increases the entropy of the deck.
As a minor nit, shuffling *in an unpredictable manner* adds entropy,
because there is extra randomness being brought into the process. If
I was one of those people who can do a perfect riffle shuffle,
reordering the cards in this entirely predictable manner does not
increase or decrease the existing entropy.
So in one sense, the answer is a simple "no"... nothing you can do to
a passphrase can increase its (that is, the passphrase's) entropy.
You can add randomness from another source, and increase the total
entropy, but I don't think that is relevant to the original question.
Greg.
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