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International Journal of Information Security

, Volume 9, Issue 6, pp 411–424 | Cite as

Efficient trace and revoke schemes

  • Moni Naor
  • Benny PinkasEmail author
Special Issue Paper

Abstract

Our goal is to design encryption schemes for mass distribution of data , which enable to (1) deter users from leaking their personal keys, (2) trace the identities of users whose keys were used to construct illegal decryption devices, and (3) revoke these keys as to render the devices dysfunctional. We start by designing an efficient revocation scheme, based on secret sharing. It can remove up to t parties, is secure against coalitions of up to t users, and is more efficient than previous schemes with the same properties. We then show how to enhance the revocation scheme with traitor tracing and self-enforcement properties. More precisely, how to construct schemes such that (1) each user’s personal key contains some sensitive information of that user (e.g., the user’s credit card number), in order to make users reluctant to disclose their keys. (2) An illegal decryption device discloses the identity of users that contributed keys to construct the device. And, (3) it is possible to revoke the keys of corrupt users. For the last point, it is important to be able to do so without publicly disclosing the sensitive information.

Keywords

User revocation Broadcast encryption Tracing traitors Self-enforcement Copyright protection 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Computer Science and Applied MathWeizmann Institute of ScienceRehovotIsrael
  2. 2.Department of Computer ScienceUniversity of HaifaHaifaIsrael

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