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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <link rel="stylesheet" type="text/css" href="help.css"/> <meta name="section" content="Preferences"/> <link rel="contents" type="text/css" href="toc.html"/> <link rel="home" type="text/css" href="index.html"/> <link rel="glossary" href="glossary.html"/> <link rel="first" href="welcome.html"/> <link rel="previous" href="privacy.html"/> <link rel="next" href="wand.html"/> <link rel="last" href="dialogs.html"/> <title>Preferences, Security</title> </head> <body> <h1 id="security">Security</h1> <p> You can manage your security certificates and configure security protocols. Opera can also warn you about potentially insecure situations. </p> <p> <span class="note">Tip:</span> Read Opera's tutorial for an excellent introduction to <a target="_blank" href="http://www.opera.com/support/tutorials/security/"> protecting your personal information and security</a> on the Internet. </p> <h2 id="security-password">Security password</h2> <p> A security password prevents other people from using your certificates, as long as you select a good password and keep it secret. Click <input type="button" class="button" value="Set password"/> to enable a security password. </p> <p> If other people have access to your computer, it may be a good idea to tell Opera to ask for a password every time needed, that is every time you use certificates. </p> <p> You can also use the security password to protect your e-mail, news, and <a href="wand.html">Wand</a> passwords with strong encryption. </p> <p> <span class="note">Technical note:</span> If you set the security password to protect Wand data and e-mail passwords, Opera will use 168-bit triple DES (data encryption standard) encryption. Keys are derived from the security password. </p> <h2 id="security-protocols">Security protocols</h2> <p> Security protocols are used to communicate securely with sites where sensitive data, such as credit card information, is involved. </p> <h3>Enabling and disabling protocols</h3> <p> To enable a security protocol, check the respective checkbox. Supported protocols include: </p> <ol> <li>Secure Socket Layer (SSL) 2.0</li> <li>Secure Socket Layer (SSL) 3.0</li> <li>Transport Layer Security (TLS) 1.0 - most secure</li> </ol> <p> Disable (uncheck) SSL 2 and SSL 3 if you wish to only use the most secure protocol (TLS) to establish secure connections. If you experience problems on secure sites, try turning SSL back on. </p> <h3>Configure protocols</h3> <p> You can click for example <input type="button" class="button" value="Configure SSL 2"/> and tell Opera not to accept certain ciphers. To prevent connections to less secure Web services, disable ciphers below 128 bits. </p> <p> <span class="note">Tip:</span> When you visit secure sites, the padlock icon on the Address bar locks. Move your mouse pointer over the security icon for detailed information about the current level of security. </p> <h2 id="security-certificates">Certificates</h2> <p> Generally, certificates are used to verify identities. </p> <h3>Authorities</h3> <p> Certificate authorities are used to identify secure Web sites. Most certificate authorities you need are installed with Opera. </p> <p> <span class="note">Example:</span> The secure version of the <a target="_blank" href="https://www.uio.no/">University of Oslo</a> Web site is authorized by the Thawte organization. </p> <table class="nice"> <tr> <th>Option</th> <th>Explanation</th> </tr> <tr> <td><input type="button" class="button" value="Import"/></td> <td>Import certificates you have exported from other browsers or downloaded</td> </tr> <tr> <td><input type="button" class="button" value="Export"/></td> <td>Export certificates you wish to use in other browsers</td> </tr> <tr> <td><input type="button" class="button" value="Delete"/></td> <td>Delete certificates you no longer trust or wish to use</td> </tr> <tr> <td> <input type="checkbox" checked="checked"/> Allow connections to sites certified by this authority </td> <td>Disable (uncheck) to block connections to all sites certified by authority</td> </tr> <tr> <td> <input type="checkbox"/> Warn before sending data to sites certified by this authority </td> <td>Enable (check) if you want Opera to warn you before using authority</td> </tr> </table> <p> <span class="note">Note:</span> If you delete a certificate authority, you must reinstall Opera or download the certificate from the original provider to restore it. </p> <p> Read about <a href="dialogs.html#certificate">accepting certificates</a> for more information. </p> <h3>Personal</h3> <p> Personal certificates are used to identify you as the genuine user of a Web service. These certificates are normally installed the first time you sign up for the service. </p> <p> The options to import, export, and delete are basically the same as for certificate authorities (see above). </p> <p> <span class="note">Note:</span> If you delete a personal certificate, you must create a new one to use the corresponding Web service. </p> <h2 id="security-warnings">Security warnings</h2> <p> By default, Opera will warn you before you submit </p> <ul> <li>a form insecurely</li> <li>a Web page for validation</li> </ul> <p> Submitting forms to, for example, search engines and open discussion forums is harmless. </p> <p> <span class="note">Tip:</span> Enable the security warnings if you are concerned about unintentionally sending sensitive data over the Internet. </p> <p> <a target="_blank" href="http://www.opera.com/support/service/security/">Learn more about security</a> </p> <p class="copyright">Copyright © 1995 - 2003 Opera Software ASA. <span class="nowrap">All rights reserved.</span></p> </body> </html>
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