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<p>and/or <a href="page.php?w=message_authentication_code">MACing</a> of messages.</p>

<p>To make unique <a href="page.php?w=session_key">session and message keys</a> the shared secret is usually combined with an <a href="page.php?w=initialization_vector">initialization vector</a> (IV).  An example of this is the <a href="page.php?w=derived_unique_key_per_transaction">derived unique key per transaction</a> method.</p>

<p>It is also often used as an authentication measure in <a href="page.php?w=web_API">web API</a>s.</p>

<p><big> See also </big></p>
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