timothy from the castle-aaaaaaaagh dept.
Attila Dimedici writes "A code expert just cracked a code used by a friend of Thomas Jefferson in a letter written to Jefferson some 200 years ago. This code is fairly easy to crack using a computer, but extremely difficult without one. I think it would have been much harder if the author had not included an indication as to what code algorithm he used in the letter accompanying the coded message."
Computers are unreliable, but humans are even more unreliable.
Any system which depends on human reliability is unreliable.