Created
March 11, 2015 20:25
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Plugboard = Hash[*('A'..'Z').to_a.shuffle.first(20)] | |
Plugboard.merge!(Plugboard.invert) | |
Plugboard.default_proc = proc { |hash, key| key } | |
def build_a_rotor | |
Hash[('A'..'Z').zip(('A'..'Z').to_a.shuffle)] | |
end | |
Rotor_1, Rotor_2, Rotor_3 = build_a_rotor, build_a_rotor, build_a_rotor | |
Reflector = Hash[*('A'..'Z').to_a.shuffle] | |
Reflector.merge!(Reflector.invert) | |
def input(string) | |
rotor_1, rotor_2, rotor_3 = Rotor_1.dup, Rotor_2.dup, Rotor_3.dup | |
string.chars.each_with_index.map do |char, index| | |
rotor_1 = rotate_rotor rotor_1 | |
rotor_2 = rotate_rotor rotor_2 if index % 25 == 0 | |
rotor_3 = rotate_rotor rotor_3 if index % 25*25 == 0 | |
char = Plugboard[char] | |
char = rotor_1[char] | |
char = rotor_2[char] | |
char = rotor_3[char] | |
char = Reflector[char] | |
char = rotor_3.invert[char] | |
char = rotor_2.invert[char] | |
char = rotor_1.invert[char] | |
Plugboard[char] | |
end.join | |
end | |
def rotate_rotor(rotor) | |
Hash[rotor.map { |k,v| [k == 'Z' ? 'A' : k.next, v] }] | |
end | |
plain_text = 'IHAVETAKENMOREOUTOFALCOHOLTHANALCOHOLHASTAKENOUTOFME' | |
puts "Encrypted '#{plain_text}' to '#{encrypted = input(plain_text)}'" | |
puts "Decrypted '#{encrypted}' to '#{decrypted = input(encrypted)}'" | |
puts 'Success!' if plain_text == decrypted |
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