What makes a system insecure?
The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it.” (the original version of this is attributed to Gene Spafford). The potential problem is caused by giving unauthorized persons physical access to the machine, where this might allow them to perform things that they shouldn’t be able to do.
