Nokia 5310 XpressMusi EN - Manual (Page 48)

card. For more information, contact your service
provider.
To view or change the security module settings, select
Menu > Settings > Security > Security module
sett..
Certificates
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.
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 your service provider.
To view the list of the authority or user certificates
downloaded to your phone, select Menu > Settings >
Security > Authority certificates or User
certificates.
During a connection if the data transmission between
the phone and the content server is encrypted,
is
displayed.
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) is secure. The service provider secures the data
transmission between the gateway and the content
server.
Digital signature
You can create digital signatures with your phone if
your SIM card has a security module. The digital
signature is the same as signing your name to a paper
bill, contract, or other document.
To create 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 be signed is shown and may include
the amount and date.
Check that the header text is Read and that the digital
signature icon is shown. If the digital signature
icon does not appear, there is a security breach; do not
enter any personal data (such as your signing PIN).
To sign the text, read all of the text first, and select
Sign. The text may not fit within a single screen.
Therefore, make sure to scroll through and read all of
the text before signing.
Select the user certificate you want to use, and enter
the signing PIN. The digital signature icon disappears,
and the service may display a confirmation of your
purchase.
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