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<p>be deterministic but semantically opaque.</p>

<p><big>IPsec</big></p>
<p><a href="page.php?w=Internet_Protocol_Security">Internet Protocol Security</a> (IPsec) was originally developed for IPv6, but found widespread deployment first in IPv4, for which it was re-engineered. IPsec was a mandatory part of all IPv6 protocol implementations, and <a href="page.php?w=Internet_Key_Exchange">Internet Key Exchange</a> (IKE) was recommended, but with RFC 6434 the inclusion of IPsec in IPv6 implementations was downgraded to a recommendation because it was considered</p><p>
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