Ars technica posted an article about the latest in cyber warfare from the stuxnet crew.
They key stretched MD5 by iterating it 10,000 times. It seems to be effective at handicapping HashCat's gpu acceleration. Had I been them I would have used bcrypt instead.
Why/When would someone prefer streched-md5 over bcrypt?
How is bcrypt superior to a strectched-MD5?
If you've got the math power $MD5(password)^n = bcrypt(password)$ solve for $N$.