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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.
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 your service provider.
To view the list of the authority or user certificates downloaded to your phone,
select Menu > Settings > Security > Authority certificates or User
certificates.
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 create digital signatures with your phone if your SIM card has a security
module. The digital signature is the same as signing your name to a paper bill,
contract, or other document.
To create a digital signature, select a link on a page (for example, the title of
the book you want to buy and its price). The text to be signed is shown and
may include the amount and date.
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