Digital Signature - Nokia 7280 User Manual

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.

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
Copyright © 2004 Nokia. All rights reserved.
M e n u f u n c t i o n s
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.
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.
To sign the text, read all of the text
first and then you can select Sign.
The text may not fit within a single
screen. Therefore, make sure to scroll
through and read all of the text
before signing.
Select the user certificate that you
want to use. Enter the signing PIN
(see "Access codes"
Read
on page vii).
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