User Manual

Services
84
User 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 by 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. See ”Security module” on page 82 .
To make a digital signature, 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.) 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.
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 you want to use. Enter the signing PIN, and select OK.
The digital signature icon will disappears, and the service may display a
confirmation of your purchase.