ld guard your key carefully. Should
someone gain access to your key, the data will be easily decrypted. If
your server is not totally under your control it’s impossible to ensure
key security so you may want to think carefully before using it for
anything that requires high security, like storing credit card numbers.</p>
<p>Your encryption key <strong>must</strong> be as long as the encyption algorithm in use
allows. For AES-128, that’s 128 bits or 16 bytes (charcters) long.
You will find a table below 