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 51 page image

50CertificatesImportant: 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 contain correct,authentic, or trusted certificates for increased security to be available. Certificateshave a restricted lifetime. If Expired certificate or Certificate not valid yet is showneven if the certificate should be valid, check that the current date and time in yourphone are correct.Before changing any certificate settings, you must make sure that you really trustthe 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 usercertificates. You may receive these certificates from your service provider. Authority certificatesand 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, selectMenu > Settings > Security > Authority certificates or User certificates.is displayed during a connection, if the data transmission between the phone and thecontent server is encrypted.The security icon does not indicate that the data transmission between the gateway andthe content server (or 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 security module.Using the digital signature can be the same as signing your name to a paper bill, contract, orother document.To make a digital signature, select a link on a page, for example, the title of the book you wantto buy and its price. The text to sign, which may include the amount 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 you should notenter 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 through and readall of the text before signing.Select the user certificate you want to use. Enter the signing PIN. The digital signature icondisappears, and the service may display a confirmation of your purchase.