Nokia 6230 User Guide 153 Copyright © 2004 NokiaServicesModule PIN request—Select On to set the phone to ask for the module PIN whenusing services provided by the security module.Change module PIN—Change the module PIN, if allowed by the security module.Change signing PIN—Select the signing PIN that you want to change, enter thecurrent PIN code; then enter the new PIN code twice.Digital signatureYou can make digital signatures with your phone if your SIM card has a securitymodule. The signature can be traced back to you through 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.1 While browsing, select a link on a page, such as the title of the book you wantto buy and its price.The text to sign (possibly including amount, date, etc.) is shown.2 Check that the header text is Read and that the digital signature icon isshown.If the digital signature icon does not appear, there is a security breach. Do notenter any personal data such as your signing PIN.3 Read all of the text before signing, scrolling through the text if necessary.4 To sign the text, select Sign.5 Select the user certificate you want to use, enter the signing PIN (providedwith the SIM card if the SIM card has a security module), and select OK.The digital signature icon disappears, and the service may display aconfirmation of your purchase.Cache memoryThe information or services you access with the browser are temporarily saved in thecache memory of the phone. A cache is a buffer memory that is used to store datatemporarily.If you tried to access or have accessed confidential information requiringpasswords (for example, your bank account), clear the cache after each use.To clear the cache from the menu, select Services > Clear the cache.To clear the cache while browsing, select Options > Other options >Clear the cache.6230.ENv1a_9310059.book Page 153 Monday, March 22, 2004 11:54 AM
