public void Challenge10()
{
var encrypted = Convert.FromBase64String(File.ReadAllText(TestContext.CurrentContext.TestDirectory + "\\resources\\10.txt"));
var key = Encoding.UTF8.GetBytes("YELLOW SUBMARINE");
var iv = Encoding.UTF8.GetBytes("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");
var output = Encoding.UTF8.GetString(AES128.DecryptCBC(encrypted, key, iv));
Assert.IsTrue(output.StartsWith("I'm back and I'm ringin' the bell"));
}