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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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** Encryption uses a box, a rectangle (or a square), or at least a size W caracterizing 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:__ DCO

DE_

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:__ CAE

SAR

__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 sign.

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.

Variants are numerous and used in many movies or books, the most known are the scytale (from Sparta, Greece), the cipher used in Journey to the center of the Earth from Jules Verne, etc.

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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Source : https://www.dcode.fr/caesar-box-cipher

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