Polybius cipher is a basic form of encryption invented by the Ancient Greek Historian whose name it bears. It is based on fractionating plaintext characters so they can be represented by a smaller set of symbols. In plain English: all the letters of the alphabet are written in a 5×5 square like the one below:
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Vigenere cipher is an encryption technique consisting of a sequence of Caesar cipher each based on the letters of a secret text called a keyword. This mechanism is classified as polyalphabetic substitution.
In Caesar substitution each letter was shifted a number of positions down the alphabet. For example choosing the secret key to be 5, . . . → Read More: Vigenere cipher
If you are the geeky type, like a lot of people I happen to know (…OK fine, yours truly also) sometime in your childhood you discovered some simple forms of encryption and became fascinated by them to the point where you started creating your own alphabets and childish methods of obscuring texts. And it’s highly . . . → Read More: Caesar cipher