Nokia 6220 User Manual page 112

Jesse draft_07_TA.fm Page 111 Thursday, May 22, 2003 8:22 AM
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. 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
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.
M e n u f u n c t i o n s
Read and that the digital signature icon
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