Nokia 6822

Page 119
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119
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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.
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