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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Posted by Jenny on Wednesday, August 13, 2008

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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