Tool to decrypt/encrypt with Caesar square. Caesar Box is a transposition cipher used in the Roman Empire, in which letters of the message are written in lines in a square (or a rectangle) and then, read by column.

Caesar Box Cipher - dCode

Tag(s) : Transposition Cipher

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Caesar Box Encryption uses a box, a rectangle (or a square), or at least a size `W` characterizing its width (that corresponds to the number of column of text)

__Example:__ Take `W=3` and the message to encrypt `DCODE`.

The message is written by lines and every `W` characters, go to a new line. This will delimitate a box of characters.

If needed, the last line can be completed with another character, e.g. `X` or `_`.

__Example:__ `DCODE_`

The encrypted message is obtained by reading the box by column.

__Example:__ The cipher text is `DDCEO_`

Caesar Box decryption requires to know the dimensions of the box (width `W` by height `H`)

__Example:__ Take `W=3`, and the ciphertext is `CSAAER` which is 6-character long, then `H=2` (as `6/3=2`).

Write the text in column in the box. The plain text appears by reading each line.

__Example:__ `CAESAR`

__Example:__ The original plain text is `CAESAR`.

The Caesar box is a transposition cipher, so the coincidence index is the same as that of the plain text.

If the length of the message is a perfect square, it is a good clue.

This cipher appears in many movies or books, the most known are the scytale (parchment / ribbon from Sparta, Greece), the cipher used in Journey to the center of the Earth from Jules Verne (Arne Saknussemm's cryptogram), etc.

One can crack Caesar Box by testing all possible size of the rectangle.

Sometimes the message has a square number of characters (16 = 4.4 or 25 = 5 * 5 or 36 = 6 * 6, etc.), which makes it possible to deduce the size of the square, but sometimes it is a totally different number of characters.

When the box is a perfect square, encryption and decryption are identical.

The scytale is the other name of this cipher.

This encryption is similar to that of the scytale cipher, which have appeared in Greece, between the 10th and 7th centuries B.C., a long time before romans and Caesar (Caius Iulius).

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