[zokier]

Passphrases do not need to be (completely) human-generated.

On a related note, has anyone analyzed the entropy of markov chain generated passphrases?

[anelson]

A while back I played with this a bit.

http://apocryph.org/archives/556

and

http://apocryph.org/archives/693

Summary: Highly entropic Markov-generated phrases are long and hard to remember.