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• User certificates are issued to users by a Certifying Authority. User certificates
are required, for example, to create a digital signature.
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 create digital signatures with your phone. The signature can be
traced back to you via the private key in the security module and the user
certificate that was used to create the signature. Using the digital signature may
be considered to be equal to a normal signature on any legal 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 that needs to be signed (possibly
including amount, date, etc.) will be shown.