     assert Matasano.hex_to_base64(hex) == base64
   end
 
+  @tag :set1
   test "set 1 challenge 2 - fixed xor" do
     a = Base.decode16!("1c0111001f010100061a024b53535009181c", case: :lower)
     b = Base.decode16!("686974207468652062756c6c277320657965", case: :lower)

    assert Matasano.decrypt_single_byte_xor(ciphertext) == plaintext
  end

  test "set 1 challenge 4 - detect single-character xor" do
    data = Matasano.IO.lines_from_hex(Path.join("data", "4.txt"))
    plaintext = "Now that the party is jumping\n"

    assert Matasano.fixed_xor(a, b) == output
  end

  @tag :set1
  test "set 1 challenge 3 - single-byte xor cipher" do
    ciphertext = Base.decode16!("1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736", case: :lower)
    plaintext = "Cooking MC's like a pound of bacon"
