Well if you've actually visted the Woodmann Forum, read the FAQ in the
BIG RED LETTERS there and then used the SEARCH button there, you would have found 47 Threads there discussing crypkey, although it is often referred to as "crapkey."
And by then, since you should be getting the hang of the SEARCH button, you should try it here, where, using "crypkey" (again without the quotes) you should find 20 threads.
And THEN, if you are really, really desperate you might actually try "Searching on the net" using something really complex, such as "crypkey tutorials" (without the quotes) which would lead to whatever tutorials are out there.
One of the most important skills a reverse engineer can learn is how to search for information.
Regards,