Quote:
Originally Posted by vorblesnak
Now move the bottom string five spaces left or right and reinsert it into the message string. Do it again using the phone number as the spacing guide.
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One of the principles of cryptology is that all analysis assumes that the "enemy" knows the system.
Any system is safe, if the enemy doesn't care to expend the energy to crack it. If you assume a large amount of energy, resources, and time, then no system is truly safe. Even one time keys have their weaknesses: key distribution, key security, key misuse, etc. If it's just you and a friend, and your messages are fairly innocent and not attractive to anyone else, the caesar sub would work. Da Vinci just wrote backwards.