Nokia 3555 User Manual

Also see for 3555: User guide User guide User guide User guide Service manual

Contents

Nokia 3555 User Manual Manual pdf 31 page image

30CertificatesImportant: Even if the use of certificates makes the risks involved in remote connectionsand software installation considerably smaller, they must be used correctly in orderto benefit from increased security. The existence of a certificate does not offer anyprotection by itself; the certificate manager must contain correct, authentic, or trustedcertificates for increased security to be available. Certificates have a restricted lifetime.If “Expired certificate” or “Certificate not valid yet” is shown, even if the certificateshould 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 theowner of the certificate and that the certificate really belongs to the listed owner.There are three kinds of certificates: server certificates, authority certificates, anduser certificates. You may receive these certificates from your service provider.Authority certificates and user certificates may also be saved in the securitymodule 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.is displayed during a connection, if the data transmission between the phoneand the content server is encrypted.The security icon does not indicate that the data transmission between the gateway and thecontent server (or the place where the requested resource is stored) is secure. The serviceprovider secures the data transmission between the gateway and the content server.Digital signatureYou can make digital signatures with your phone if your SIM card has a securitymodule. Using the digital signature can be the same as signing your name to apaper bill, contract, or other document.To make a digital signature, select a link on a page, such as, the title of the bookyou want to buy and its price. The text to sign, which may include the amount anddate, is displayed.Check that the header text is Read and that the digital signature iconis displayed.If the digital signature icon does not appear, there is a security breach, and youshould not enter any personal data such as your signing PIN.To sign the text, read all of the text first, and select Sign.The text may not fit within a single screen. Therefore, make sure to scroll throughand read all of the text before signing.Select the user certificate you want to use. Enter the signing PIN. The digital signatureicon disappears, and the service may display a confirmation of your purchase.