class VigenereCipher
        ALPHA = ('A'..'Z').to_a

        def encode(cleartext,key)
            scrttxt = prepare_text(cleartext)
            scrtky = prepare_key(key, scrttxt.length)
            ciphertext = ""
            for i in 0...(scrttxt.length)
				ciphertext += ALPHA[(ALPHA.index(scrttxt[i]) + ALPHA.index(scrtky[i])) % 26 ]
			end
            ciphertext
        end

        def decode(ciphertext,key)
			scrttxt = prepare_text(ciphertext)
			scrtky = prepare_key(key,scrttxt.length)
			cleartext = ''
			for i in 0...(scrttxt.length)
				cleartext += ALPHA[(ALPHA.index(scrttxt[i]) - ALPHA.index(scrtky[i])) % 26 ]
			end
			cleartext
        end

        def prepare_text(text)
			text.gsub(/\s/, '').upcase.split ''
		end

		def prepare_key(key, length)
			key += key while key.length < length
			key[0..length].upcase.split ''
		end
    end

    decoderring = VigenereCipher.new
	secret = decoderring.encode('Dude you are a total kerl where are you', 'proctor')
	secret_revealed = decoderring.decode(secret,'proctor')
	puts secret
	puts secret_revealed