Opera allows for a wide range of cookie setups. You can allow all cookies to be stored on your computer. You can refuse all cookies to be stored. Or, you can selectively allow certain cookies and certain types of cookies.

Your first option is whether to enable cookies at all. Note that you may have difficulties logging on to a significant amount of Web sites if you leave this unchecked.

The next step is deciding which cookies to accept and which to refuse. You can choose to allow only cookies that are set by the Web site you are visiting, not by any other sites whose content is displayed in frames or via images on the current page. You can choose to be prompted every time you receive a cookie, and to delete all new cookies when exiting Opera.

Managing cookies

Clicking "Manage cookies" takes you to your Server Manager, which lists all the domains you currently have cookies from. You can add new domains, delete the domains you do not wish to keep cookies from and edit cookie settings specifically for each server.

These cookie settings are also available on any site, using site preferences; Tools >Quick preferences > Edit site preferences.

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Cookies are: Strings of text, pieces of information stored in files that Web servers store on your computer when you are browsing. These files let the same servers recognize your computer the next time you visit their sites.

Cookies are not: Viruses. They cannot cause direct damage to your computer system in any way, but they can record your browsing habits in intrusive manners and trace your movements across different Web sites.

Some sites use cookies to store your user name, which means, for example, that for 10 hours after you log in with your password, you will not have to retype your password when you check your e-mail. This is a convenience, but it can also be a security hazard if others have access to the computer you are using.

Another use of cookies is to store information about the pages in a site that you have visited previously. This allows a Web site to customize itself with fresh content, rather than showing you the old material, and to present you with content you might be interested in based on what you have already viewed on the site.

Note that the "Use cookies to trace password-protected pages" option in the privacy preferences does not affect Internet activity, it merely uses the cookies saved to remove password-protected pages from your cache, and is thus mainly of interest if you are using Opera with a shared user account.

Invalid cookies

There are types of cookies that Opera will refuse regardless of whether you have set the browser up to handle all cookies. These are cookies set for top-level domains: domains ending in .com, .net, and .org, among others. Such cookies are considered invalid or illegal and are blocked because:

·                       Any Web site could read such a cookie's contents, it would have unlimited access.

·                       The only use for such cookies is to track surfers across the Web.

Opera will not let you accept these cookies.

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All browsers keep records of where you have been on the Internet, and even store Web pages and other files (such as graphics) in a local folder known as the cache. Your cache folder can thus contain sensitive information. If you do not want other users to know about certain sites that you have visited, your history may point them to these sites, and your cache may contain local copies of the content of those sites.
If you do not want Opera to store your history, go to Tools > Preferences > Advanced > History and set the number of both typed-in and visited addresses to be stored, to 0. You may also set the cache to "Empty on exit", which means that it will be cleared when Opera is closed.
Cookies
Note that cookies are often used to simplify logins, remember personal information in Web forums and so forth. Such cookies should not be passed on to the next user. The easiest means of avoiding this, is to clear all cookies before closing Opera. This, too, can be automated. Go to Tools > Preferences > Advanced > Cookies and opt to clear all new cookies on exit.
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Are you sharing your computer with colleagues, family, or co-habitants? Do you surf with Opera on publically accessible computers? This page holds some tips for maintaining privacy within the same computer and user account.

Shared Computer

First of all, when installing Opera on a multi-user Windows computer, make sure to opt for separate user directories during install. This will ensure that your settings, e-mail, Wand passwords, history, and so forth, are stored in your own user directory only. Remember that this may be of little use if other users have administrator privileges on the same machine, unless you protect your files by other means.

Shared Account

If the same user account is being used by several people, for example on a library, there are other precautions to take that will help guard your privacy.

When using Opera on a shared user account, the following features may raise privacy concerns, and you should consider whether you want to disable them, avoid them, or use them with caution:

• E-mail, Usenet news, newsfeeds, and chat (Tools > Mail and chat accounts and Feeds > Manage feeds to disable)
• The Wand (Tools > Preferences > Advanced > Security to disable or set master password, and Tools > Preferences > Wand to manage stored passwords)
• Auto-completion of forms (Tools > Preferences > Wand should be kept empty or used for generic, non-sensitive information only)
• Saved sessions and "Continue from last time" (use Tools > Preferences > General to set Opera to start with your home page and disable the start-up dialog)
• User JavaScript (use Tools > Preferences > Advanced > Content > JavaScript options to clear the "My JavaScript files" field). Note that User JavaScript is not loaded on secure pages.

The network settings that may affect your security and privacy mainly have to do with proxy servers. A proxy server collects information from the Internet and stores it locally, making the information available for viewing by anyone using proxy server. If your Internet service provider (ISP) has a proxy server available, configuring Opera to go through this proxy could speed up your surfing.

Proxy Server Settings

HTTP and HTTPS

Do not use a proxy server for HTTP or HTTPS unless you have particular reasons to do so. Opera is more than suited to handle these protocols. HTTPS is the secure version of the hypertext transfer protocol, and Opera can handle the highest levels of Internet security available. If you use a proxy server to handle HTTPS content, you are reducing your computer's level of security to that of the weakest application, which could be your proxy server.

Most HTTPS proxies simply pass on data and do not save or interpret the information that passes through them. This is because the information is encrypted. In special cases, it is possible for a proxy server to decrypt the information and act as a man in the middle. In such cases, Opera will display a warning unless you have already accepted and installed a certificate for the proxy in question.

Other settings

Advanced users may want to use a proxy server for most sites, but exclude some. This option is available and is activated by selecting "Do not use proxy on the addresses below". If you want to access certain sites directly, Opera will not use a proxy server for the Internet addresses you specify. 

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The settings in Tools > Preferences > Advanced > Network and Tools > Preferences > Advanced > Cookies determine how Web servers handle and monitor your net activities.
Referrer logging
Some Web sites register the site that referred you to them. This information can be used to control content by delivering documents that have some bearing on the site that you came from. If you prefer not to allow a Web site to know where you were before visiting it, especially if you were on a local, secure, or restricted site, disable this option. Note, however, that some sites depend on referrer logging internally.
Enable automatic redirection
Sometimes a site might redirect your browser to a different URL, often because the site has moved. Leaving this option enabled does not constitute a big security risk, but turn it off if you want complete control of what sites you visit.
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E-mail security
If you leave the authentication type for your login as "Auto", Opera will try the most secure authentication available and then work its way down the list should the first type fail. The authentication types available to you will depend on the mail server. Note that this will not encrypt your actual mail data, only your login.
Adding certificates in Opera
Reputable on-line merchants have their public keys signed by authorities, which are trusted security firms. These firms issue digital certificates that contain the public key, signed in a way that can be automatically proven. To display your current list of authorities, click "Manage certificates". Opera, like all secure browsers, comes with a set of certificates. Most of the time, certificates are fully valid, and if there is something questionable about a certificate, a warning dialog will be displayed. You may choose to proceed, but full security cannot be guaranteed at this point. Warnings may say:
Server certificate expired. Certificates have expiry dates, and they must be renewed on a regular basis by the people maintaining the site. Accepting an expired certificate does not necessarily reduce security, but consider the site you are visiting and how long it has been since the certificate expired, before accepting.
Wrong certificate name. A certificate is issued by an authority for a single site to use, and sites cannot borrow certificates from each other, as this invalidates the whole concept of certificates. Accepting a certificate belonging to another site is not recommended.
Certificate signer not found. If the signer of a certificate is not found in your list of authorities, only accept the certificate if you are absolutely confident that whoever is running the site in question, can be trusted.
Some certificates are self-signed, which means that they are signed by the Web site owners themselves, and not an authority outside the organization. If you know that the signer can be trusted, and you want all sites using this signer to be considered as safe, install the certificate to add the signer to your list of authorities. Trusting self-signed certificates from for example your employer can be considered as safe.
It is unlikely that you will need to upgrade Opera's existing certificates, as most of them will not expire for a decade or more. The necessary updates are taken care of with each new release of the Opera browser.
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