title: How to append to AES encrypted file
body: <p>I'm writing some kind of logger that produces encrypted log-file. Unfortunately, cryptography is not my strong side. Now I can write to file several messages and then close file. Then i can open it, append some messages, close again and after decryption I see padding bytes in the middle of file. Is there any way to work with encrypted file without having to decrypt it every time I want to append some messages?</p>
  
  <p><strong>EDIT</strong>: little more details. Current implementation utlizes CipherOutputStream. As i understand there's no way to <em>seek</em> using it.
  Can i use 'NoPadding' option if i will control that output data size is divisible by block size?</p>