Public Key Encryption

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Public key encryption is an extraordinary recent development that has made internet commerce possible. It allows people to encrypt and decrpyt messages without having to share a password to unlock them. It is hard to believe that such a system could exist, yet this mode of encryption is widely used because it is so easy to set up. This activity works with two people, but it's most exciting with a whole class, with everybody else trying to intercept a message sent between two students.

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Computer Science Unplugged

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