I don't think you necessarily need special training. A value of 1 should immediately make you wonder why you are providing it as in input at all. Interestingly,

I don't think you necessarily need special training. A value of 1 should immediately make you wonder why you are providing it as in input at all. Interestingly, even a small prime, like 3, has no known vulnerability (but it allows other vulnerabilities to be attacked faster)