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In this cipher, a 5 x 5 grid is filled with the letters of a mixed alphabet (two letters, usually I and J, are combined). A digraphic substitution is then simulated by taking pairs of letters as two corners of a rectangle, and using the other two corners as the ciphertext (see the Playfair cipher main article for a diagram). Special rules ...
In the majority of alternades, every second letter is used to make two smaller words, but in some cases, every third letter is used to make three smaller words. Theoretically, a very long word could use every fourth letter to make four smaller words; e.g., «partitioned» is an alternade for «pin», «ate», «rid», and «to».
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. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. [1] The method is named after Julius Caesar, who used it in his private correspondence.
The two letters of the digram are considered opposite corners of a rectangle in the key table. To perform the substitution, apply the following 4 rules, in order, to each pair of letters in the plaintext: If both letters are the same (or only one letter is left), add an "X" after the first letter. Encrypt the new pair and continue.
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Blanagram: rearranging the letters of a word or phrase and substituting one single letter to produce a new word or phrase; Letter bank: using the letters from a certain word or phrase as many times as wanted to produce a new word or phrase; Jumble: a kind of word game in which the solution of a puzzle is its anagram
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