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Delastelle Trifid Cipher

Tool to decrypt / encrypt with Delastelle's Trifide number using 3 grids to convert each character into a triplet (grid, line, column) before transposing the grid to find an encrypted character.

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Delastelle Trifid Cipher -

Tag(s) : Poly-Alphabetic Cipher

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Delastelle Trifid Cipher

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See also: Bifid Cipher

Delastelle's Trifid Encoder






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Tool to decrypt / encrypt with Delastelle's Trifide number using 3 grids to convert each character into a triplet (grid, line, column) before transposing the grid to find an encrypted character.

Answers to Questions

How to encrypt using Delastelle Trifid cipher?

The Delastelle trifid cipher uses 3 9-character grids (for 27 distinct characters in total) and an integer $ N $ (usually 5 or 7).

Example: Encrypt the message SECRET, with $ N = $ 5 and grids

Grid 1Grid 2Grid 3
\123
1ABC
2DEF
3GHI
\123
1JKL
2MNO
3PQR
\123
1STU
2VWX
3YZ_

Often, a keyword is used to generate a disordered alphabet with 27 characters (the Latin alphabet accompanied by another symbol like _ replacing any non-alphabetic character)

Step 1: For each character, search for it in grids and note are triplet of 3 corresponding digits (grid, line, column)

Example: S is in grid 3, line 1, column 1, its triplet is 311

Step 2: Write the triplets in columns, in groups of $ N $ columns next to each other and read each group in rows.

Example:

SECRE|T
311213
121321
123322

Reading group 1: 31121,12132,12332, group 2: 312

Step 3: Cut out each sequence of digits read in triplet group of 3 digits corresponding to (grid, line, column) and note the corresponding letter. These letters constitute the encrypted message.

Example: 311,211,213,212,332,312 corresponds to SJLKZT

How to decrypt Delastelle Trifid cipher?

Decryption is very similar to encryption, the difference is in step 2.

Example: Decrypt the message SJLKZT, with $ N = $ 5 and grids

Grid 1Grid 2Grid 3
\123
1ABC
2DEF
3GHI
\123
1JKL
2MNO
3PQR
\123
1STU
2VWX
3YZ_

Step 1: identical to encryption

Step 2: Take the triplets in groups of $ N $ and write them in $ N $-length lines below each other then read each group in columns.

Example: 311,211,213,212,332,312 s'écrit

31121|312
12132|
12333|

Reading group 1: 311,122,113,233,123, group 2: 3,1,2

Step 3: Identical to encryption

Example: 311,122,113,233,123,312 corresponds to the plain message SECRET

How to recognize a Trifid ciphertext?

The message is theoretically composed of not more than 27 distinct characters.

What are the variants of the Trifid cipher?

The $ N $ number quickly changes the encrypted message, for better encryption, it is advisable to take a value of $ N $ first with 3.

When Trifid have been invented ?

Félix Delastelle described this encryption in 1902 in his book Traité Élémentaire de Cryptographie

Source code

dCode retains ownership of the source code of the script Delastelle Trifid Cipher online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be released for free. To download the online Delastelle Trifid Cipher script for offline use on PC, iPhone or Android, ask for price quote on contact page !

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