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It is a resposibility of the service provider to secure the data transmission
between the gateway and the content server.
• Authority certificates
Authority certificates are used by some WAP services, such as banking services,
for checking the signatures of server certificates or other authority certificates.
You can download authority certificates from WAP pages, if the WAP service
supports the use of authority certificates. If you save the certificate, it is added
to the certificate list on the phone. Authority certificates may also be available
in the security module.
• User certificates
User certificates are issued to users by a Certifying Authority. They associate a
user with a specific private key in a security module and they are saved in the
module by the SIM card issuer or the service provider.
Digital signature
You can make digital signatures using your phone. The signature can be traced
back to you via the private key and the associated certificate that was used for the
signature. Using the digital signature can be seen as the same as signing your
name to a paper bill, contract or other document.
To use the digital signature, select a link on a WAP page, for example, the title of a
book you want to buy and its price. The text to be signed, possibly including the
amount and date, for example, will be shown.
Check that the header text is Read and the digital signature icon is shown.