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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 and 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.
The phone notifies you 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. While opening the certificate details, the phone checks the validity of the
certificate, and one of the following notes may appear:
Expired certificate — The validity period has ended for the selected certificate.
Certificate not valid yet — The validity period has not yet begun for the selected
certificate.
Certificate corrupted — The certificate cannot be used. Contact the certificate
issuer.
Certificate not trusted — You have not set any application to use the certificate.
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.
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