Welcome aboard GrunT,
to be honest with you, your two CD-keys won't help in finding the algo. That's done through other methods. But they will help us create and test cheats. Just don't post them in public. It also seems like it's illegal to post CD-keys on US-servers (=absurd laws). But you _can_ always PM them to anyone you want.
This new CD-key system is bad. Once Call of Juarez started to require CD-keys for online play almost nobody wanted to play that game anymore. I hope this won't happen to ArmA. But if one takes the amount of advertising etc into consideration few players will learn about the game, just like with CoJ. And people won't even bother downloading the game if they know they are unable to play MP. As a result less people will play it, and buy it. Folks won't buy games they haven't tested just to play MP.
Moreover, CD-key checks opens up for an authoritarian EA-like admin style. If you insult the admin or if he just doesn't like your name (yes it has happened) he will be able to ban your cd-key. There's also a built-in global ban. This limits the freedom of online play, and should therefore be fought. We, the players, bought the game and demand our right to play the game as we wish. Against us we have status- and power- hungry clan server admins and money wanting game-devs and publishers.
However, even if they've got the upper hand now, we'll eventually take the lead as the ArmA devs have made a big mistake by indirectly publishing valid cd-keys on the net.
Of course I'll buy the game and get a valid CD-key that way, as it's one of my fav games. But if ArmA gets few players it's everyone's loss.