Class: Cipher::Substitution

Inherits:

SimpleCipher

• Object
• SimpleCipher
• Cipher::Substitution

show all

Defined in:

lib/cipher/subst.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) key readonly

  Returns the value of attribute key.

Instance Method Summary (collapse)

• - (Object) decode(cipher_text)

  decode.

• - (Object) encode(plain_text)

  encode.

• - (Substitution) initialize(key = '') constructor

  initialize.

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# File 'lib/cipher/subst.rb', line 21

def initialize(key = '')
  @key = Key::SKey.new(key)
end

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# File 'lib/cipher/subst.rb', line 17

def key
  @key
end

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# File 'lib/cipher/subst.rb', line 36

def decode(cipher_text)
  plain_text = cipher_text.each_char.inject('') do |text, ct|
    text + @key.decode(ct)
  end
  return plain_text
end

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# File 'lib/cipher/subst.rb', line 27

def encode(plain_text)
  cipher_text = plain_text.each_char.inject('') do |text, pt|
    text + @key.encode(pt)
  end
  return cipher_text
end