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IT-Sec/crypto_challenges/Monoalphabetic_Substitution/challenge/challenge.adoc

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  1. = Monoalphabetic substitution cipher

  2. 

  3. Task

  4. ----

  5. 

  6. The letters in link:./ciphertext.txt[this file] are encrypted with a monoalphabetic substitution cipher.

  7. The encrypted message consists a single line ending with a newline.

  8. Decrypt the message!

  9. 

  10. How

  11. ---

  12. 

  13. . Write a program that sorts the letters of the encrypted message text by frequency

  14.     .. Use your developed frequency analyzer to derive the statistical distribution of the letters

  15.     .. Do not use an online tool to solve this challenge!

  16. . Use this link:./monoalphabetic_substitution.html[tool] and start substituting according to the link:./english_freq.txt[most common letters list]