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Tool to decrypt / encrypt with a columnar transposition, also called column permutations cipher, a cryptographic technique that modifies the order of the letters of a previously written text in a table.
- Redefence Cipher
Redefence Decoder. Redefence ciphertext . Keep punctuation...
- Zig-Zag
A message encoded by Rail-Fence has an index of coincidence...
- Caesar Box Cipher
The Caesar box is a transposition cipher, so the coincidence...
- Route/Path Cipher
Route cipher is a way of writing a message using a...
- Double Transposition Cipher
Double Transposition Decoder. Double Transposition...
- Redefence Cipher
Tool to decode columnar transposition ciphers. In a columnar transposition cipher, the message is written in a grid of equal length rows, and then read out column by column. The columns are chosen in a scrambled order, decided by the encryption key.
The columnar transposition cipher consists to write a message in a table of width N (with N, the size of the permutation), row by row (or column by column), to permute the columns according to the order of the key and read the result in columns (or by rows).
Columnar Transposition involves writing the plaintext out in rows, and then reading the ciphertext off in columns. In its simplest form, it is the Route Cipher where the route is to read down each column in order.
Column transposition uses a rectangular arrangement (also called a matrix or grid), consisting of several rows (as many as are necessary to enter the plain text). The number of columns is given by the length of the key (also called keyword). The plaintext is then entered into the grid line by line.
A columnar transposition, also known as a row-column transpose, is a very simple cipher to perform by hand. First, you write your message in columns. Then, you just rearrange the columns.
This page deals with automated cracking of columnar transposition ciphers with no known crib. The only thing we know about the plaintext is that it is English. For cracking these ciphers by hand or with a crib, different techniques can be used.
