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Rot13 Simple encryption method. It shifts each character of the clear text string 13 positions forward in the alphabet.
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Cesar Method in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
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Decoder Cesar Cypher Brute force attack (trying all possible shifts and determining which one works).
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Vigenère Vigenere cipher is a poly-alphabetic substitution system that use a key and a double-entry table.
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Frequency Analysis Is the study of the frequency of letters or groups of letters in a ciphertext.
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Vernam Is, in theory, a perfect cipher. Instead of a single key, each plaintext character is encrypted using its own key. This key — or key stream — is randomly generated or is taken from a one-time pad, e.g. a page of a book. The key must be equal in length to the plaintext message. To use the Vernam cipher, you will need to use an XOR operation.