Nokia 5200 Manual page 84

W e b
Certificates
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.
There are three kinds of certificates: server certificates, authority
certificates, and user certificates. You may receive these certificates
from your service provider. Authority certificates and user certificates
may also be saved in the security module by the service provider.
To view the list of the authority or user certificates downloaded into
your phone, select
or User
is displayed during a connection, if the data transmission between
the phone and the content server is encrypted.
The security icon does not indicate that the data transmission between the
gateway and the content server (or place where the requested resource is stored)
www.DataSheet4U.com
is secure. The service provider secures the data transmission between the
gateway and the content server.
Digital signature
You can make digital signatures with your phone if your SIM card has a
security module. Using the digital signature can be the same as signing
your name to a paper bill, contract, or other document.
To make a digital signature, select a link on a page (for example, the title
of the book you want to buy and its price). The text to sign is shown,
which may include the amount and date.
Check that the header text is
is shown.
84
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.
Menu >
certificates.
Settings > Security
Read and that the digital signature icon
> Authority certificates