Nokia N73 - Manual (Page 95)

Tools
94
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.
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," p. 94.
• 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.
Scroll to an authority certificate, and select Options >
Trust settings . Depending on the certificate, a list of the
applications that can use the selected certificate is shown.
For example:
• Symbian installation : Yes —The certificate is able
to certify the origin of a new Symbian operating
system application.
• Internet : Yes —The certificate is able to certify servers.
• App. installation : Yes —The certificate is able to certify
the origin of a new Java TM application.
Select Options > Edit trust setting to change the value.