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Copyright © 2004 Nokia. All rights reserved. 67
• 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 (network service). 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.
To sign the text, read all of the text
first and then you can select Sign.
Note: The text may not fit
within a single screen.
Therefore, make sure to
scroll through and read all
of the text before signing.