substitution_cipher.rb

module SubstitutionCipher
  module Caesar
    # Encrypts document using key
    # Arguments:
    #   document: String
    #   key: Fixnum (integer)
    # Returns: String
    def self.encrypt(document, key)
      # TODO: encrypt string using caesar cipher
    end

    # Decrypts String document using integer key
    # Arguments:
    #   document: String
    #   key: Fixnum (integer)
    # Returns: String
    def self.decrypt(document, key)
      # TODO: decrypt string using caesar cipher
    end
  end

  module Permutation
    # Encrypts document using key
    # Arguments:
    #   document: String
    #   key: Fixnum (integer)
    # Returns: String
    def self.encrypt(document, key)
      # TODO: encrypt string using a permutation cipher
    end

    # Decrypts String document using integer key
    # Arguments:
    #   document: String
    #   key: Fixnum (integer)
    # Returns: String
    def self.decrypt(document, key)
      # TODO: decrypt string using a permutation cipher
    end
  end
end