RC4 Attack

[DARKER]

Has somebody experience with attack on RC4? I am interested for case when we have known key length, we have encrypted message and we know start bytes from original message. I read a lot of PDF's but i don't find something "practical", no applications for analyzing this scenario... BF attack doesn't have sense (160bits, 20 bytes), maybe something more scientific.. Any ideas?

[Carbon]

Some people think that the NSA can decrypt RC4 in real-time, but nobody knows how. Maybe they have enough computing power or they have found a nonpublic security hole. You will not find a practical public attack against RC4. If you can invent a practical attack, you will earn a bag of money.