Nokia 6136

Page 97
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97
Certificates
Important: 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 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.
There are three kinds of certificates: server certificates, authority certificates, and 
user certificates. You may receive these certificates from your service provider. 
Authority certificates and user certificates may also be saved in the security 
module by the service provider.
To view the list of the authority or user certificates downloaded into your phone, 
select 
Menu
> 
Settings
> 
Security
> 
Authority certificates
 or 
User certificates
.
The security indicator 
 is displayed during a connection, if the data 
transmission between the phone and the content server is encrypted.
The security icon does not indicate that the data transmission between the 
gateway and the content server (or place where the requested resource is stored) 
is secure. The service provider secures the data transmission between the 
gateway and the content server.
Digital signature
You can make digital signatures with your phone if your SIM card has a security 
module. 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, such as the title of the book 
you want to buy and its price. The text to sign is displayed, which may include the 
amount and date.
Check that the header text is 
Read
 and that the digital signature icon 
 is 
shown.
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