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Spiral Cipher

Tool to write/read a spiral cipher. The spiral encryption/writing system consists to write a text in a quadrangular spiral and read it by lines or columns.

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Spiral Cipher -

Tag(s) : Transposition Cipher

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Spiral Cipher

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Tool to write/read a spiral cipher. The spiral encryption/writing system consists to write a text in a quadrangular spiral and read it by lines or columns.

Answers to Questions

How to encrypt by writing in Spiral?

To encrypt a message by spiral writing, imagine a quadrangular spiral (written in a square). Then write the message by turning like a spiral/snail.

Example: Code SPIRALS99 via an inner spiral from the top left, clockwise direction:

SPI
99R
ELA

Example: Code CYCLONIC! via an outer spiral from below, trigonometric rotation:

INO
CCL
!YC

If the spiral does not end exactly, it is possible to add any character, like X (avoid spaces because invisible).

The final encrypted message is generally constituted by a reading in rows or columns of the grid obtained.

Example: The ciphertext is S9SP9LIRA (example 1) or IC!NCYOLC (example 2)

How to decrypt a spiral written cipher?

Decryption is writing the message in rows or in columns and reading the text in a spiral. It is necessary to know the mode of writing (inward or outward, trigonometric direction or clockwise, etc.)

Example: RNOOSITAT written in rows in a square grid becomes

RNO
OSI
TAT

a spiral reading gives the plain message ROTATIONS.

How to recognize Spiral ciphertext?

Since spiral encryption is a transposition cipher, the coincidence index of the text is the same of the original plain message language.

Sometimes a word or text is formed on one or all of the lines created, the word can be written backwards.

Ideally the encrypted message has a number of square characters (whose square root is an integer: 9, 16, 25, 36 etc.)

What are the variants of the Spiral cipher?

The variants of the spiral writing reside in the text writing (internal or external spiral) and direction (clockwise or counterclockwise spiral), but also in reading the text (line, column or even starting from the end)

It also possible to use another pattern than a spiral, see route cipher.

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Source code

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Questions / Comments


Team dCode likes feedback and relevant comments; to get an answer give an email (not published). It is thanks to you that dCode has the best Spiral Cipher tool. Thank you.


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