Perspective: to "sign it ourselves", you are asking in a few words to accomplish something an entire community of code and math-minded people would like to do, and companies that would make millions more if this could be done. And we are up against proven math algorithms that have been tested across decades, that in turn have their origins in thousands of years more of math theory, and accomplishing what you request would effectively "break the world", leaving billions of people and trillions of dollars at risk for cash grab.
In short although your question is easy to ASK it is ASKING A LOT, just like it's easy to ask the question "how can we go faster than light?" but the challenges involved and the reality you're up against makes it almost impossible.
People have been thinking about this. A LOT. It's well documented if you want to do the research, and if you can't understand it, START understanding it with these articles if you are truly interested. It is a lot of mental work just to grasp how digital signatures work. You have no easy answers. Just hard work so you can reach the same conclusions we all have: it's nigh impossible without some monumental mistake from Nintendo.
In short although your question is easy to ASK it is ASKING A LOT, just like it's easy to ask the question "how can we go faster than light?" but the challenges involved and the reality you're up against makes it almost impossible.
People have been thinking about this. A LOT. It's well documented if you want to do the research, and if you can't understand it, START understanding it with these articles if you are truly interested. It is a lot of mental work just to grasp how digital signatures work. You have no easy answers. Just hard work so you can reach the same conclusions we all have: it's nigh impossible without some monumental mistake from Nintendo.