Nokia N78 User Manual page 143

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.
142
To check certificate details, scroll to a certificate, and
select Options Certificate
>
certificate details, the validity of the certificate is checked,
and one of the following notes may be displayed:
Certificate not trusted
●
application to use the certificate.
Expired certificate
●
for the selected certificate.
Certificate not valid yet
●
not yet begun for the selected certificate.
Certificate corrupted
●
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.
Scroll to an authority certificate, and select
Trust settings. Depending on the certificate, a list of the
applications that can use the selected certificate is shown.
For example:
Symbian installation:
●
certify the origin of a new Symbian operating system
application.
Internet: Yes — The certificate is able to certify
●
servers.
App. installation: Yes
●
certify the origin of a new Java™ application.
details. When you open
— You have not set any
— The period of validity has ended
— The period of validity has
— The certificate cannot be
Options
Yes — The certificate is able to
— The certificate is able to
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