title: ios - encrypt/decrypt NSString
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone">AES Encryption for an NSString on the iPhone</a>  </p>
  </blockquote>
  
  
  
  <p>What is the best way to encrypt or decrypt <code>NSString</code> using a custom key?</p>
  
  <p>Is there any good library for that ?</p>