Tool to decrypt / encrypt with a transposition in columns. Column transposition encryption, also called column permutations, is a cryptographic technique that modifies the order of the letters of a previously written text in a table.
Columnar Transposition Cipher - dCode
Tag(s) : Transposition Cipher
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Example: The text COLUMNS is encrypted with the permutation 1,3,2 of the key word COL, it is written in the table
Fill in the empty boxes with a neutral letter (like X).
The encrypted message is then read in columns
It is possible to read line by line, in which case the encrypted message would be CLOUNMSXX
Decryption by Columnar Transposition is similar to encryption. The difference lies in the writing in the table (in rown or in column according to the reading method used during the encryption), as well as in the order of the columns which are permuted before being sorted again in ascending order.
Example: A permutation 1,3,2 was used to obtain the message CUSLNXOMX (reading by columns):
|Permuted cols||1,3,2||Sorted cols||1,2,3|