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 63 page image

62CertificatesImportant: Even if the use of certificates makes the risks involved in remoteconnections and software installation considerably smaller, they must be usedcorrectly in order to benefit from increased security. The existence of a certificatedoes not offer any protection by itself; the certificate manager must containcorrect, authentic, or trusted certificates for increased security to be available.Certificates have a restricted lifetime. If Expired certificate or Certificate not validyet is shown even if the certificate should be valid, check that the current date andtime in your phone 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 place where the requested resource is stored) is secure. The service providersecures 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, for example, the title of thebook you want to buy and its price. The text to sign, which may include theamount and date, is shown.Check that the header text is Read and that the digital signature icon is shown.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.