PKI-5

|
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
 4 views
of 22

Please download to get full document.

View again

Description
PKI Part 5: Non-repudiation Kjell Jørgen Hole NoWires Research Group Department of Informatics University of Bergen last changed October 21, 2011 Outline ã Introduction to non-repudiation ã types of non-repudiation ã technical model ã Non-repudiation service based on PKI ã mechanisms for non-repudiation ã Dispute resolution? 2 Standard definitions ã Non-repudiation. Offers a person protection against a false claim by another person that a communication never took place ã Non-repudiation of ori
Share
Tags
Transcript
  Kjell Jørgen HoleNoWires Research GroupDepartment of InformaticsUniversity of Bergen last changed October 21, 2011 Outline ãIntroduction to non-repudiationãtypes of non-repudiationãtechnical modelãNon-repudiation service based on PKIãmechanisms for non-repudiationãDispute resolution? 2  Standard definitions ã Non-repudiation. Offers a person protectionagainst a false claim by another person thata communication never took placeã Non-repudiation of srcin. A personcannot falsely deny having srcinated amessage or documentã Non-repudiation of delivery. A personcannot falsely deny having received amessage or document 3 Legal view (1) ãNon-repudiation consists of the abilityto convince athird partythat a specificmessage or document srcinated with,or was delivered to a certain personãCredible evidenceis needed to persuade aã judge,ã jury, orãarbitrator 4  Legal view (2) ãBoth the quality and the presentation ofthe evidence determine the degree  ofnon-repudiation 5 Trusted third party needed ãTo obtain a high degree of non-repudiation,it is essential that at least one Trusted ThirdParty   (TTP) collects, validates, time stamps,signs, and stores relevant non-repudiationevidence 6  Non-repudiation in practice ãNon-repudiation consists of the ability toprove to a third party andafter the factthata specific communication srcinated with orwas delivered to a certain personãcredible evidence is needed to persuadethe judge, jury, or arbitrator that there isenough non-repudiation 7 Example: signed messagevia traditional mail ãSupports a moderate degree of non-repudiationãDifficult to forge signatureãPhysical bindingof signer’s identity to messageãCan use witnesses to increase degree of non-repudiation 8
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks