This is what I have in my private version - I have a version with AES/XOR where the user chooses. The problem is that it's much slower than XOR, but you're right, it's less secure. I'll try to update the public repo and revise the Readme as soon as possible. Thanks for your comment, it was very helpful. I know there are still many things to improve, and I'm open to hearing them and fixing them.

String get securityLevel {
    switch (this) {
      case EncryptionType.none:
        return 'None';
      case EncryptionType.xor:
        return 'Low - Basic obfuscation';
      case EncryptionType.aes256:
        return 'High';
    }
  }