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119Copyright © 2005 Nokia. All rights reserved.
saved in the security module by the service provider, or they can be downloaded
from the network if the service supports the use of authority certificates.
User certificates—Issued to users by a Certifying Authority. User certificates are
required [for example, to create a digital signature], and they associate the user
with a specific private key on a security module.
Note: 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 Certificate invalid according to phone's date or
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 device 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 117.