Nothing is secure, you just have to try your best and arm yourself with as much salt as possible. All you can do is try, you can keep 99% of people out with various methods, but eventually you will be exploited.
...thats only if you are targeted by an individual or a group for a particular reason. If someone wants your information and they are intelligent, then all it takes is time.
If its legal in your country, you should try out AES-256 encryption.