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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>