the location for settings.xml and security-settings.xml is by default your home directory ($HOME/.m2/) which is by default secured by your login (username/password). This is the first barrier and the second one of course is, as Scott wrote is that in none of them is a clear text password.
Karl Heinz Marbaise
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.