W e b86 Copyright © 2005 Nokia. All rights reserved.CertificatesImportant: Even if the useof certificates makes therisks involved in remoteconnections and softwareinstallation considerablysmaller, they must be usedcorrectly in order tobenefit from increasedsecurity. The existence ofa certificate does not offerany protection by itself;the certificate managermust contain correct,authentic, or trustedcertificates for increasedsecurity to be available.Certificates have arestricted lifetime. IfExpired certificate orCertificate not valid yet isshown even if thecertificate should be valid,check that the currentdate and time in yourdevice are correct.Before changing anycertificate settings, youmust make sure that youreally trust the owner ofthe certificate and thatthe certificate reallybelongs to the listedowner.There are three kinds ofcertificates: server certificates,authority certificates, and usercertificates. You may receive thesecertificates from your serviceprovider. Authority certificates anduser certificates may also be savedin the security module by theservice provider.To view the list of the authority oruser certificates downloaded intoyour phone, select Menu > Web >Settings > Security settings >Authority certificates or Usercertificates.The security indicator isdisplayed during a connection, ifthe data transmission between thephone and the content server isencrypted.The security icon does not indicatethat the data transmissionbetween the gateway and thecontent server (or place where therequested resource is stored) issecure. The service providersecures the data transmissionbetween the gateway and thecontent server.Digital signatureYou can make digital signatureswith your phone if your SIM cardhas a security module. Using thedigital signature can be the same