Nokia 7280 User Manual

Also see for 7280 - Cell Phone - GSM: User guide User guide Service manual

Contents

W e b75Important: Note that even if the use of certificates makes the risksinvolved in remote connections and software installation considerablysmaller, they must be used correctly in order to benefit from increasedsecurity. The existence of a certificate does not offer any protection byitself; the certificate manager must contain correct, authentic, or trustedcertificates for increased security to be available.Certificates have a restricted lifetime. If "Expired certificate" or "Certificatenot valid yet" is shown, even if the certificate is supposed to be valid,check that the current date and time in your phone are correct.Before changing any certificate settings, you must make sure that youreally trust the owner of the certificate and that the certificate reallybelongs to the listed owner.Digital signatureYou can make digital signatures with your phone, if your SIM card has a securitymodule. The signature can be traced back to you by both the private key on thesecurity 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. To make a digital signature:1. Select a link on a page, such as, the title of the book that you want to buy andits price.The text to sign (possibly including amount, date, etc.) is displayed.2. Verify that the header text is Read and that the digital signature iconis shown.If the digital signature icon does not appear, there is a security breach, andyou should not enter any personal data, such as your signing PIN.3. To sign the text, read all of the text first, and select Sign.The text may not fit within a single screen. Make sure to scroll through andread all the text before signing.4. Select the user certificate you want to use.5. Enter the signing PIN (see Access codes on page 20), and select OK.The digital signature icon disappears and the service may display aconfirmation of your purchase.