Nokia 6230 Nokia 6230 User Guide in English - Page 159
Digital signature, Cache memory, Module PIN request, Change module PIN, Change signing PIN
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Module PIN request-Select On to set the phone to ask for the module PIN when using 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 the current PIN code; then enter the new PIN code twice. Digital signature You can make digital signatures with your phone if your SIM card has a security module. The signature can be traced back to you through the private key on the security 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 want to 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 is shown. If the digital signature icon does not appear, there is a security breach. Do not enter 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 (provided with the SIM card if the SIM card has a security module), and select OK. The digital signature icon disappears, and the service may display a confirmation of your purchase. Cache memory The information or services you access with the browser are temporarily saved in the cache memory of the phone. A cache is a buffer memory that is used to store data temporarily. If you tried to access or have accessed confidential information requiring passwords (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. 146 Copyright © 2004 Nokia