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+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+ - License, v. 2.0. If a copy of the MPL was not distributed with this
+ - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
+ "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"[
+ <!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
+ %brandDTD;
+]>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>SSL Settings</title>
+<link rel="stylesheet" href="helpFileLayout.css"
+ type="text/css"/>
+</head>
+<body>
+
+<h1 id="ssl_settings">SSL Settings</h1>
+
+<p>This section describes how to set your SSL preferences.</p>
+
+<div class="contentsBox">In this section:
+ <ul>
+ <li><a href="#privacy_and_security_preferences_ssl">Privacy &amp; Security
+ Preferences - SSL</a></li>
+ </ul>
+</div>
+
+<h2 id="privacy_and_security_preferences_ssl">Privacy &amp; Security
+ Preferences - SSL</h2>
+
+<p>This section describes how to use the SSL preferences panel. If you are not
+ already viewing the panel, follow these steps:</p>
+
+<ol>
+ <li>Open the <span class="mac">&brandShortName;</span>
+ <span class="noMac">Edit</span> menu and choose Preferences.</li>
+ <li>Under the Privacy &amp; Security category, click SSL. (If no
+ subcategories are visible, double-click Privacy &amp; Security to expand
+ the list.)</li>
+</ol>
+
+<h3 id="ssl_protocol_versions">SSL Protocol Versions</h3>
+
+<p>The Secure Sockets Layer (SSL) protocol defines rules governing mutual
+ authentication between a web site and browser software and the encryption of
+ information that flows between them. The Transport Layer Security (TLS)
+ protocol is an IETF standard based on SSL. TLS 1.0 can be thought of as SSL
+ 3.1.</p>
+
+<p>You should normally leave these three checkboxes selected to ensure that
+ both older and newer web servers can work with the browser:</p>
+
+<ul>
+ <li><strong>Enable SSL version 3</strong>: Allows newer web servers to work
+ with the browser.</li>
+ <li><strong>Enable TLS</strong>: Allows web servers that support TLS to take
+ advantage of it.</li>
+</ul>
+
+<p><strong>Important note regarding TLS</strong>: Some servers that do not
+ implement SSL correctly cannot negotiate the SSL handshake with client
+ software (such as the browser) that supports TLS. Such servers are known as
+ <q>TLS intolerant</q>.</p>
+
+<p>When the Enable TLS option in the SSL preferences panel is selected, the
+ browser attempts to use the TLS protocol when making secure connections with
+ a server. If that connection fails because the server is TLS intolerant, the
+ browser will fall back to using SSL 3.0.</p>
+
+<h3 id="ssl_warnings">SSL Warnings</h3>
+
+<p>It&apos;s easy to tell when the web site you are viewing is using an encrypted
+ connection. If the connection is encrypted, the lock icon in the lower-right
+ corner of the browser window is locked. If the connection is not encrypted,
+ the lock icon is unlocked.</p>
+
+<p>If you want additional warnings, you can select one or more of the warning
+ checkboxes in the SSL preferences panel. Some people find these warnings
+ annoying.</p>
+
+<p>To activate any of these warnings, select the corresponding checkbox:</p>
+
+<ul>
+ <li><strong>Loading a page that supports encryption</strong>: Select this
+ warning if you want to be reminded whenever you are loading a page that
+ supports encryption.</li>
+ <li><strong>Loading a page that uses low-grade encryption</strong>: Select
+ this warning if you want to be reminded whenever you are loading a page
+ that supports low-grade encryption. (Low-grade encryption is the weakest
+ encryption available, using 40-bit keys.)</li>
+ <li><strong>Leaving a page that supports encryption</strong>: Select this
+ warning if you want to be reminded whenever you are leaving a page that
+ supports encryption for one that does not.</li>
+ <li><strong>Sending form data from an unencrypted page to an unencrypted
+ page</strong>: Select this warning if you want to be reminded whenever you
+ are submitting data over an unencrypted connection. If you send unencrypted
+ information over the Internet, it can easily be intercepted by other
+ people.</li>
+ <li><strong>Viewing a page with an encrypted/unencrypted mix</strong>:
+ Select this warning if you want to be alerted whenever you are viewing a
+ page that includes any information that&apos;s not encrypted.</li>
+</ul>
+
+<p>For short definitions, click
+ <a href="glossary.xhtml#authentication">authentication</a>,
+ <a href="glossary.xhtml#encryption">encryption</a>, or
+ <a href="glossary.xhtml#certificate">certificate</a>.</p>
+
+<p>For more information about ciphers and encryption, see the following online
+ documents:</p>
+
+<ul>
+ <li>
+ <a href="http://developer.mozilla.org/en/Introduction_to_Public-Key_Cryptography">Introduction
+ to Public-Key Cryptography</a></li>
+ <li>
+ <a href="http://developer.mozilla.org/en/Introduction_to_SSL">Introduction
+ to SSL</a></li>
+ <li>
+ <a href="http://www.mozilla.org/projects/security/pki/nss/nss-3.11/nss-3.11-algorithms.html">Encryption
+ Technologies Available in NSS 3.11</a>.</li>
+</ul>
+
+</body>
+</html>