Pff, I just use ROT-13 for all my
encryption needs. In fact I ROT-13'd this very post twice for extra
security. None of you suckers will have any idea what I'm saying.
Mwahaha.
2 times ROT-13 is not strong enough by far. Try using ROT-52 for optimal security ;p
for those who still haven't figured it out. the ROT encryption was also used before there were computers. it is so mindboggingly simple that you could consider it a 'tree-house' or 'boy-scout' kinda algorithm. primairily used by 8-jr olds.
mostly though, ROT-x is used for numbers that are not 26*a for any whole numder a (in our western alphabet that is), because it would ruin the whole point of the encryption.