I don't know a lot about security although I do have an interest in old fashioned cryptography techniques. They are fun puzzles to try and work through. The modern rfid chips and prime number based public and private keys are so beyond the ability of normal humans to calculate that they have taken the romance out of the skill.
It is pretty fascinating to me that it is all basically based on there being no fast way to factor prime numbers. If some math genius ever figured out a fast way to do that it could turn encryption on it's head. It would make it incredibly difficult to send things over a wire anywhere due to security concerns.
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