Manual Nokia 3220 tempo music (page 60 of 81) (English)

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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 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.

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). They associate the user

with a specific private key in 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 Expired certificate or Certificate not valid yet are shown,

even if the certificate should be valid, verify that the current date and

time in your device are correct.

Before changing any certificate settings, you must make sure that you trust the

owner of the certificate and that the certificate 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. To use

the digital signature, can be the same as signing your name to a paper bill,

contract, or other document. See also “Security module” on page 52.

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.

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Nokia 3220 tempo music Manual

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