Implements the Rot26 cipher.

Contrary to popular belief, implementing Rot26 is far from an easy task (it takes at least two dozen lines of Haskell code). One needs to take into account the possibility of side-channel attacks by an oracle while also ensuring that the encryption key is generated via a perfect random number generator. Fortunately, this library takes care of all those icky details.

The library is very easy to use. Here is a basic example:

import Rot26
main = do
  let secretKey  = generateSecretKey
  let ciphertext = encrypt secretKey "Hello world"
  let plaintext  = decrypt secretKey ciphertext
  putStrLn plaintext  -- this should say "Hello world"