Skype’s RC4 key expansion algorithm finally reversed (after 10 years)

link update: <a href="http://twitter.com/dugsong/status/18015100357" rel="nofollow">http://twitter.com/dugsong/status/18015100357</a>, <a href="http://skyperc4.pastebin.com/g1xFFFcr" rel="nofollow">http://skyperc4.pastebin.com/g1xFFFcr</a>