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<p>fails and the connection is not created.</p>

<p>Note that TLS 1.3 only allows key exchange algorithms providing <a href="page.php?w=forward_secrecy">forward secrecy</a>. Consequently, establishing a PreMasterSecret using the server's public and private key is only available in TLS 1.2 and below.</p>

<p>TLS and SSL do not fit neatly into any single layer of the <a href="page.php?w=OSI_model">OSI model</a> or the <a href="page.php?w=internet_protocol_suite">TCP/IP model</a>. TLS runs "on top of some reliable transport protocol (e.g., <a href="page.php?w=Transmission_Control_Protocol">TCP</a>)",</p><p>
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