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DIY Cipher wheel, with templates. It uses a pin and eraser to spin the wheels, but think you can use a butterfly clasp just as well.

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In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

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The Caesar shift cipher is actually 26 different ciphers, one for each letter of the alphabet. ROT1 is just one of these ciphers. A person only needs to be told which Caesar cipher was used in order to decipher a message. This cipher is the basis for many more complex ciphers, but on its own does not allow great protection of a secret message, as checking 26 different cipher keys does not take a relatively great amount of time. Li bra ghflskhu wklv dqg bra nqrz lw, fods brxu kdqgv.

3D Printed Caesar Cipher Decoder Ring by cymon at Thingverse. Link: http://www.thingiverse.com/thing:18315

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Caesar cipher

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