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Rail fence transposition ciphers

In a rail fence cipher, the plaintext letters are written diagonally in a up-down pattern from left to right. The message is then read row-by-row from top to down. The number of rows can vary, and the starting place for the first letter can vary.

Plaintext: This is a secret text.

 T           a           t
   h       s   s       e   t      .
     i   i       e   r       e   t
       s           c           x

Ciphertext: Tat hsset. iieret scx

Scripts

  • railfence_encrypt.py
  • railfence_decrypt.py
  • railfence_hack.py
  • railfence_test.py

Usages

Encrypt

usage: railfence_encrypt.py [-h] [-t PLAINTEXT] [-k KEY]

Rail fence transposition cipher encryption

options:
  -h, --help            show this help message and exit
  -t PLAINTEXT, --plaintext PLAINTEXT
                        Plaintext to encrypt
  -k KEY, --key KEY     Number of layers

Example:
            railfence_encrypt.py -t plaintext
            railfence_encrypt.py -t plaintext -k 4

Decrypt

usage: railfence_decrypt.py [-h] [-t CIPHERTEXT] [-k KEY]

Rail fence transposition cipher decryption

options:
  -h, --help            show this help message and exit
  -t CIPHERTEXT, --ciphertext CIPHERTEXT
                        Ciphertext to decrypt
  -k KEY, --key KEY     Number of layers

Example:
            railfence_decrypt.py -t ciphertext
            railfence_decrypt.py -t ciphertext -k 4

Bruteforce hack

usage: railfence_hack.py [-h] [-t CIPHERTEXT]

Rail fence transposition cipher hack

options:
  -h, --help            show this help message and exit
  -t CIPHERTEXT, --ciphertext CIPHERTEXT
                        Ciphertext to hack

Example:
            railfence_hack.py -t [message]