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112
Glossary: Digital certificates are used to verify
the origin of the XHTML or WML pages and
installed software. However, they can only be
trusted if the origin of the certificate is known
to be authentic.
Digital certificates should be used if you want to
connect to an online bank or another site or
remote server for actions that involve
transferring confidential information. They
should also be used if you want to reduce the
risk of viruses or other malicious software and
be sure of the authenticity of software when
downloading and installing software.
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 the device are correct.
View certificate details—check authenticity
You can only be sure of the correct identity of a server
when the signature and the period of validity of a server
certificate have been checked.
You are notified on the device display if the identity of the
server is not authentic or if you do not have the correct
security certificate in the device.
To check certificate details, scroll to a certificate, and
select Options > Certificate details. When you open
certificate details, the validity of the certificate is checked,
and one of the following notes may be displayed:
• Certificate not trusted—You have not set any application
to use the certificate. See "Change the trust settings" on
page 112.
• Expired certificate—The period of validity has ended
for the selected certificate.
• Certificate not valid yet—The period of validity has
not yet begun for the selected certificate.
• Certificate corrupted—The certificate cannot be used.
Contact the certificate issuer.
Change the trust settings
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.