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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When you send or receive information from a site where Opera's icon displays "Secure", Opera and the Web site use a secret one-time key before sending the information. When you entered the secure page, Opera and the Web site used public keys to agree on that secret key. That is called a handshake. The key encrypts all the information sent and is used for this session only.
The level of encryption depends on the available key space, which means the number of possibilities when generating keys. The more possible keys, the higher the security. For session keys, the most powerful form of encryption available in browsers today is 256-bit encryption. Although Opera supports as much as 3072-bit encryption when generating key pairs (a public key and a private key), some secure sites may not support this level of encryption. Opera's default setting of 1024-bit encryption should work with most secure sites.
The number on the padlock icon signals the level of encryption. Three dots means that the Web site has a high level of security. When rating the security level of a secure document, Opera takes into consideration the following:
Everything loaded with the page, including images, frames, and redirects
Insecure images will automatically result in a level one rating
Other insecure content (such as scripting) will result in level zero
The size of the symmetric key
The server's public key size
Only documents using the most secure methods, 3-DES or 128-bit C4 and public keys larger than approximately 900 bits, get a level three rating.
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Encryption is a way of scrambling information so that only a legitimate recipient of that information can make it readable again. The most common form of encryption today is public key/private key encryption. Imagine a strongbox that has two keyholes and two separate keys. If you lock the box using one key, you can only unlock it with the other.
Security protocols
Hovering the padlock icon when visiting a secure server, you will see a string of text that looks something like this: TLS v1.0 128 bit C4 (1024 bit RSA/SHA)
The first three letters will show what security protocol is used on the site. There are four common security protocols; in order from good to best, these are SSL version 2, SSL version 3, TLS 1.0, and TLS 1.1.
SSL
SSL stands for "secure sockets layer". SSL version 3 is better than version 2, which is being phased out and is only used by a small number of Web sites these days.
TLS
TLS is short for "transport layer security", a security protocol based on SSL. This is considered the most secure protocol in common use today.
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Opera is designed with the most advanced and widespread security measures available, making on-line purchasing simple.
Some sites may greet you with a page saying something along the lines of "You do not have a secure browser; please download Netscape Communicator or Internet Explorer." The site designer may, mistakenly, believe that only those browsers support advanced security, although Opera has levels of security that are as good as or superior to these browsers.
Changing how Opera identifies itself will often allow you to circumvent this problem: press F12 to display the Quick Preferences dialog box, then use Edit site preferences > Network, and select to "Identify as" Mozilla or Internet Explorer. When you have selected one of these alternatives, go back to the page you were attempting to enter.
Before you enter any information about yourself, especially credit card details, look for the security bar that should appear on the address bar. On the security bar, there should be an icon that looks like a locked padlock. If you hover your mouse over the icon, you will see what kind of encryption the site uses. The organizational name of the security certificate holder should appear beside the padlock icon.
Some Web sites will open a separate window with the address bar hidden. In this case, Opera will display the security bar as a collapsed address bar that shows the domain that the window belongs to. Before you enter any sensitive information, check that the domain matches the domain that you were expecting. You can also click the collapsed address bar to show the full address bar, and security bar.
Opera supports internationalized domain names (IDN), which allows domain names in languages such as Russian and Chinese to be written in their own native scripts. Opera will only allow certain combinations of scripts to be displayed in localized characters, unless the top level domain is trusted. Trusted top level domains are selected if they have established strict policies on the domain names they allow to be registered.
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