How to make a keygen?

im pretty sure most of you would refer me a "noob" or something similar for posting this, but ive been looking around the keygens and such and decided, HECK i wanna make one of these, after hours of searching i couldn't find a single tutorial or aanything on how to make a keygen, im almost certain i will get almost all negative comments about this topic and telling me reasons why not to ask this, but i really want to find out.

If you do however dont think im a noob for asking this and dont give negative comments and actually give a howto, could you please "try" to explain it so that i can understand, plus im pretty certain there are heaps more people here that want to know alongside me.

In return enjoy this funny image.