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AMSCO Cipher

Tool to decrypt/encrypt AMSCO automatically. AMSCO is a transposition ciphering algorithm created by A.M.Scott which uses column transpositions.

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AMSCO Cipher -

Tag(s) : Cryptography,Transposition Cipher

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AMSCO Cipher

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Tool to decrypt/encrypt AMSCO automatically. AMSCO is a transposition ciphering algorithm created by A.M.Scott which uses column transpositions.

Answers to Questions

How to encrypt using AMSCO cipher?

AMSCO Encryption consists in writing a text in a grid according to a cutting sequence then use a permutationhref key to switch columns.

Let the message be DCODEAMSCO, the cutting sequence 1,2 (alternation of 1 letter then 2 letters in the grid)

A permutationhref key is selected (of length L), and one writes the message in lines, cut over L columns.

If the key is KEY (equivalent to 2,1,3) of length 3, then one writes the message over 3 columns :

\123
DCOD
EAMSC
O

One reads the grid in columns, in the order of the key (this reading serves as permutationhref).

So column 2 (COM) then 1 (DEAO), and the 3 (DSC). The message is COMDEAODSCC.

How to decrypt AMSCO cipher?

Decryption requires knowledge of the permutationhref key (of length L) and the cutting sequence (usually 1,2 or 2,1).

Let the encrypted message be COMDEAODSCC (of 10-characters length), the key KEY (equivalent to the permutationhref 2,1,3) of length 3, and cutting sequence 1.2.

A table with L columns is created, in which the number of characters are noted in each cell (in respect to the cutting sequence and limited by the length of the message).

With 1,2 for 10 characters one gets (1+2+1+2+1+2+1+0+0 = 10) :

\123
121
212
100

Write the message in the table in columns following the order of the columns indicated by the key.

Write CO, then M in column 2, then D,EA,O in column 1, then D, DC in column 3. This leads to the grid:

\123
DCOD
EAMSC
O

The plain message is transcribed by reading the table in lines.

Reading each lines gives the original plain text is DCODEAMSCO.

How to correctly split the text into the grid?

The text must alternate sizes of cuts which then should form diagonal sets:

A grid of width 3, cut by (1,2):

\123
121
212
121

A grid of width 3, cut by (2,1):

\123
212
121
212

A grid of width 4, cut by (1,2):

\1234
1212
2121
1212

A grid of width 3, cut by (3,2,1):

\123
321
213
132

How to recognize AMSCO ciphered text?

The ciphered message is subjected to a single transposition, so it has an index of coincidencehref similar to the one of the plain text.

How to decipher AMSCO without key?

It is possible to try to infer the key length by analyzing bigrams obtained after writing in columns.

What are the variants of the AMSCO cipher?

AMSCO is a variant of the classical transposition cipher. It adds the cut sequence that can be more complex than the usual 1,2.

When AMSCO have been invented?

By A. M. Scott, in the 19th centuryhref

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Source code

dCode retains ownership of the source code of the script AMSCO Cipher. Except explicit open source licence (free / freeware), any algorithm, applet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any snippet or function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in PHP (or Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the AMSCO Cipher script for offline use, for you, your company or association, see you on contact page !

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Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best AMSCO Cipher tool. Thank you.


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