Welcome to the Ranch
Sorry nobody seems to know the answer yet.
What is “Key”? Is it the same as
this? In one of those methods, it appears simply to return the name of the algorithm, but I don’t know about the other two. I did some googling for tutorials and found several hits. I don’t know whether they are any good, but here are a few:
1 2 3.
This question is too difficult for “beginning”, so I shall try moving it to our security forum.