Nokia N90

Page 112
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Tools
112
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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 on the phone display if the identity of the 
server is not authentic or if you do not have the correct 
security certificate in your phone.
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. 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.
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 application.
Select 
Options
 > 
Edit trust setting
 to change the value.
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