Digital Signature - Nokia 6822 User Manual

Certificates
There are three kinds of certificates:
Server certificates—Used by the phone to create a connection with improved
security to the content server. The phone receives the server certificate from the
service provider before the connection is established, and its validity is checked
using the authority certificates saved in the phone. Server certificates are not saved.
The security indicator
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.
Authority certificates—Used by some services, such as banking services, for
checking the validity of other certificates. Authority certificates can either be
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.
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 Certificate invalid according to phone's date
not valid yet
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 74.
Nokia 6822 User Guide
is displayed during a connection if the data transmission
is shown even if the certificate should be valid, check that
75
S e r v i c e s
or User certificate
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