Certificates; Digital Signatures - Nokia 5140 User Manual

S e r v i c e s

Certificates

Important: Note that 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.
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. The security indicator
is displayed during a connection if the data transmission
between the phone and the content server is encrypted.

Digital signatures

You can create digital signatures with your phone. The
signature can be traced back to you by the private key in the
security module and the user certificate that was used to
perform the signature. Using the digital signature is similar to
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 a book that you want to buy and its price.
The text to sign (including, for example, the amount and date)
will be shown.
Check that the header text is
icon is shown.
Read and that the digital signature
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