title: The performance concern of AES (RijndaelManaged) in .NET
body: <p>I intend to encrypt large data (around 3-5 MB) with <strong>RijndaelManaged</strong>. Is there any performance issue\suggestion on doing so? </p>
  
  <p>Thanks</p>
  
  <pre><code>        RijndaelManaged rijndaelCipher = new RijndaelManaged();
          rijndaelCipher.Mode = CipherMode.CBC;
          rijndaelCipher.Padding = PaddingMode.PKCS7;
          rijndaelCipher.KeySize = 128;
          rijndaelCipher.BlockSize = 128;
  </code></pre>