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Certificates
Important: Even if the use of certificates makes the risks involved in remote connections and software installation
considerably smaller, they must be used correctly in order to benefit from increased security. The existence of a
certificate does not offer any protection by itself; the certificate manager must contain correct, authentic, or
trusted certificates for increased security to be available. Certificates have a restricted lifetime. If Expired
certificate or Certificate not valid yet is shown even if the certificate should be valid, check that the current date
and time in your device are correct.
Before changing any certificate settings, you must make sure that you really trust the owner of the certificate and that the
certificate really belongs to the listed owner.
There are three kinds of certificates: server certificates, authority certificates, and user certificates. You may
receive these certificates from your service provider. Authority certificates and user certificates may also be
saved in the security module by the service provider.
To view the list of the authority or user certificates downloaded into your phone, select Menu > Settings >
Security > Authority certificates or User certificates.
The security indicator is displayed during a connection, if the data transmission between the phone and the
content server is encrypted.
The security icon does not indicate that the data transmission between the gateway and the content server (or place where
the requested resource is stored) is secure. The service provider secures the data transmission between the gateway and the
content server.
Digital signature
You can make digital signatures with your phone if your SIM card has a security module. Using the digital
signature can be the same as signing your name to a paper bill, contract, or other document.
To make a digital signature, select a link on a page, such as the title of the book you want to buy and its price.
The text to sign is displayed, which may include the amount and date.
Check that the header text is Read and that the digital signature icon is shown.