Nokia 7280 - Manual (Page 76)

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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 is supposed to be valid,
check that the current date and time in your phone 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 by both 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:
1. Select a link on a page, such as, the title of the book that you want to buy and
its price.
The text to sign (possibly including amount, date, etc.) is displayed.
2. Verify that the header text is Read and that the digital signature icon
is shown.
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.
3. To sign the text, read all of the text first, and select Sign .
The text may not fit within a single screen. Make sure to scroll through and
read all the text before signing.
4. Select the user certificate you want to use.
5. Enter the signing PIN (see Access codes on page 20), and select OK .
The digital signature icon disappears and the service may display a
confirmation of your purchase.