nd SHA512 HMAC authentication.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">AES-128 is chosen both because it is proven to be strong and
because of its wide availability across different cryptographic
software and programming languages’ APIs.</p>
</div>
<p>However, the <em>encryption_key</em> is not used as is.</p>
<p>If you are somewhat familiar with cryptography, you should already know
that a HMAC also requires a secret key and using the same key for both