title: How to choose an encryption algorithm to encrypt/decrypt a file?
body: <p>Recently I am writing a QT program that require me to encrypt/decrypt a file. I am new to encryption where I am totally don't know anything on how to do encryption using programming. After googling a while, I found this <a href="https://stackoverflow.com/questions/1262081/how-to-encrypt-and-decrypt-a-file-with-qt-c">thread</a> which is very similar to my objective. 
  They suggest to use crypto++, but my problem is when I reach there, there are plenty of selection for encryption. I just want to encrypt a file, doesn't need a sophisticate one, and don't need a password to open the file. Only my program can open and read that file. </p>
  
  <p>May I know how to choose the encryption algorithm that is suite for me? </p>
  
  <p>THanks @!</p>