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103
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 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.
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 if the identity of the server is not
authentic or if you do not have the correct security
certificate in your 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 103.
• 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.