So using our message and the key, the we'd create the following cipher: The row starting with A and the column starting with R intersect at R. For example, the row starting with M and the column starting with G intersect at S. Using the table above, we match the message letter to a row and the corresponding key letter to a column and find the letter at their intersection on the table. We would repeat the key word until it matched the length of the message (in this case, GRAVITYGRAVITYGRAV). On each additional row, the shift of the letters is increased by 1.Īs Vigenère ciphers are a bit more complicated, consider the following example: we want to encrypt the message MABELEATSSPRINKLES and use GRAVITY as the key. The square is 26 rows of Caesar ciphers starting with a zero letter shift. Vigenère ciphers use a Vigenère square, like the one below, to encrypt the message. Vigenère cipher is a series of Caesar ciphers where each letter shift depends on a key word. These codes are solvable by taking the number beside a parenthesis as an episode number, and the other numbers beside them represents a letter in that episode's credits cryptogram. Season 2's combined ciphers start with the Vigenère cipher. The first time such cipher has been used is at the end of "Gideon Rises." It's solved by converting to letters using the A1Z26 cipher, then flipping the letters with the Atbash cipher, and finally by using the Caesar cipher. This cipher also encrypts some punctuation, and the symbols for Q, X, and Z are unknown.Ī combined cipher is a mix of two or more ciphers seen in the show. The symbols are hidden on many pages of the journals. In Journal 3, a symbol substitution cipher is used by The Author. In other words, you simply mirror the alphabet. The Atbash cipher works like the Caesar cipher, only instead of adding or subtracting 3 to letters 1-26, you apply A1Z26 with a numbering scheme of -13 to -1 and then 1 to 13 (skipping 0), then multiplying by -1. You decrypt by doing the same backwards, adding -3 or +23 (so A decrypts to X, for example). The Caesar cipher (or shift cipher) used in Gravity Falls uses a shift of +3 or -23: you encrypt by applying the A1Z26 cipher above, adding +3 or -23 using modular addition (so 1-3=25), and then undoing A1Z26 to get a letter. Several other ciphers used in Gravity Falls work by applying this cipher first and then doing arithmetic - decryption is then done by reversing the arithmetic. The A1Z26 cipher is a simple substitution cipher decoded by substituting the n th letter of the alphabet for given number n (and back again).
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