Digital Signature - Nokia 6021 User Manual

M e n u f u n c t i o n s
• Authority certificates are used by
some services, such as banking
services, for checking the validity
of other certificates. Authority
certificates can either be saved in
the security module by the
service provider, or they can be
downloaded from the network, if
the service supports the use of
authority certificates.
• User certificates are issued to
users by a Certifying Authority.
User certificates are required, for
example, to create a digital
signature and they associate the
user with a specific private key in
a security module.
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
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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.

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 that 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
and that the digital signature icon
is shown.
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