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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.

Plaintext: This is a secret text Key: 4

3 1 2 4
T h i s
- i s -
a - s e
c r e t
- t e x
t - - -

Ciphertext: hi rt issee T ac ts etx

Scripts

  • columnar_encrypt.py
  • columnar_decrypt.py
  • columnar_hack.py
  • columnar_file_cipher.py
  • columnar_file_hack.py
  • columnar_test.py

Usages

Encrypt

usage: columnar_encrypt.py [-h] [-t TEXT] [-k KEY]

Columnar transposition cipher encryption

options:
  -h, --help            show this help message and exit
  -t TEXT, --text TEXT  Message to encrypt
  -k KEY, --key KEY     Key (Number)

Example:
            columnar_encrypt.py -t sometext
            columnar_encrypt.py -t sometext -k 13

Decrypt

usage: columnar_decrypt.py [-h] [-t TEXT] [-k KEY]

Columnar transposition cipher decryption

options:
  -h, --help            show this help message and exit
  -t TEXT, --text TEXT  Message to decrypt
  -k KEY, --key KEY     Key (Number)

Example:
            columnar_decrypt.py -t sometext
            columnar_decrypt.py -t sometext -k 13

Hack

usage: columnar_hack.py [-h] [-t TEXT]

Columnar transposition cipher hack

options:
  -h, --help            show this help message and exit
  -t TEXT, --text TEXT  Message to hack

Example:
            columnar_hack.py -t [message]

File encrypt/decrypt

usage: columnar_file_cipher.py [-h] [-i INPUT_FILENAME] [-o OUTPUT_FILENAME] [-k KEY] [-m {encrypt,decrypt}]

Columnar transposition cipher encrypt/decrypt file

options:
  -h, --help            show this help message and exit
  -i INPUT_FILENAME, --input_filename INPUT_FILENAME
                        Takes input from a file name of your choice
  -o OUTPUT_FILENAME, --output_filename OUTPUT_FILENAME
                        Directs the output to a name of your choice
  -k KEY, --key KEY     Key (Number)
  -m {encrypt,decrypt}, --mode {encrypt,decrypt}
                        encrypt or decrypt

Example:
            columnar_file_cipher.py -i input_filename.txt -o output_filename.txt -k 13 -m encrypt