Nokia 3109 User Manual Page 65

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Security module
The security module improves security services for
applications requiring a browser connection and allows
you to use a digital signature. The security module may
contain certificates as well as private and public keys.
The certificates are saved in the security module by the
service provider.
To view or change the security module settings, select
Menu > Settings > Security > Security module
settings.
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.
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)
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.
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