There is Alice and there is Bob. But what is the name of the malicious user?
That's a funny question, I think it depends on the kind of attack you're performing.
For example, when you're trying to eavesdrop a communication, it's usually &quot;Eve&quot; who's doing it.
For more generic attacks, &quot;Mallory&quot; (Coming from &quot;malice&quot;) is the most common choice.
As Stephen Ullrich pointed out in his comment, here's a list of all the commonly used characters: https://en.wikipedia.org/wiki/Alice_and_Bob