title: Encryption (Symmetric key) lib
body: <p>I have been reading a little bit about Encryption.</p>
  
  <p>I'm currently in a project where I'll need to Encrypt/Decrypt data based on a key (user password), but the problem is:
   - I'll need to encrypt/decrypt in several client applications built with different languages. Example:
     - PHP
     - C++
     - Java
  etc.</p>
  
  <p>What should I do? is there any good (and free) lib that was written to different languages?</p>
  
  <p>thank you</p>