Yes, I stand by what I said. AES (Rijndael) block cipher operates only on 128-bit blocks, <i>not on data that&#x27;s divisible by 16-bytes</i>. This is an important distinction. Calling <i>AES used in CTR&#x2F;CBC&#x2F;etc. mode without mentioning it at all</i>, &quot;AES&quot; speaks much about the sophistication and cryptographic quality of the guide. That&#x27;s what I was alluding to.