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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 & Security
Preferences - SSL</a></li>
</ul>
</div>
<h2 id="privacy_and_security_preferences_ssl">Privacy & 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 & Security category, click SSL. (If no
subcategories are visible, double-click Privacy & 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'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'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>
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