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Menu functions
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Menu functions
• User certificates are issued to users by a Certifying Authority. User certificates are required, for
example, to make a digital signature and they associate the user with a specific private key in a
security module.
Important: Note, however, 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.
Important: 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 phone are correct.
Important: Before changing these settings, you must make sure that you really trust the
owner of the certificate and that the certificate really belongs to the listed owner.
Digital signature
You can make digital signatures with your phone if your SIM card has a security module. The signature
can be traced back to you via the private key on the security module and the user certificate that was
used to perform the signature. 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 (possibly including amount, date, etc.) will be shown.
Check that the header text is Read and that the digital signature icon is shown.
Note: If the digital signature icon does not appear, there is a security breach, and you should
not enter any personal data such as your signing PIN.