Inverse RC4

Given the keystream output from RC4 (ARC4), is there an inverse RC4 function which would give me either the key schedule or even the original key.

I have the plaintext, the cyphertext, the key stream, and the nonce which is mixed with an unknown key. I'm trying to recover that unknown key part.

Assume that the first N-bytes of the keystream were not discarded.

Yuri's Night

OMG, Yuri's Night is tomorrow! It snuck up on me. There's not a party at NASA this year though. This looks like the only one nearby: http://www.calacademy.org/events/nightlife/ It's supposed to be cold here this weekend, so I'm not interested in spending much time outdoors. But the California Academy of Sciences is indoors. But I'm also not really that interested in partying anywhere this weekend, I have stuff to do.

See also: http://yurisnight.net/main/
See also: http://yurisnight.net/parties/partylist.php


Update: So, now having actually taken a closer look, the party up at the Cal Academy of Science is on the 9^th of April. And there's nothing local tomorrow.
See also: http://en.wikipedia.org/wiki/Yuri%27s_Night
See also: http://www.ynba.org/