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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">
<chapter>
<header>
<copyright>
<year>2015</year>
<year>2015</year>
<holder>Ericsson AB, All Rights Reserved</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
The Initial Developer of the Original Code is Ericsson AB.
</legalnotice>
<title>Introduction</title>
<prepared>OTP team</prepared>
<docno></docno>
<date>2015-03-05</date>
<rev>A</rev>
<file>ssl_introduction.xml</file>
</header>
<section>
<title>Purpose</title>
<p>Transport Layer Security (TLS) and its predecessor, the Secure
Sockets Layer (SSL) are cryptographic protocols designed to
provide communications security over a computer network. They
use x.509 certificates and hence asymmetric cryptography to
authenticate the counterparty with whom they are communicating,
and to exchange a symmetric key. This session key is then used
to encrypt data flowing between the parties. This allows for
data/message confidentiality, and message authentication codes
for message integrity.</p>
</section>
<section>
<title>Prerequisites</title>
<p>It is assumed that the reader is familiar with the Erlang
programming language, the concepts of OTP, and has a basic
understanding of SSL/TSP.</p>
</section>
</chapter>
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