Efficient Trace and Revoke Schemes

  • Moni Naor
  • Benny Pinkas
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1962)

Abstract

Our goal is to design encryption schemes for mass distribution of data in which it is possible to (1) deter users from leaking their personal keys, (2) trace which users leaked keys to construct an illegal decryption device, and (3) revoke these keys as to render the device dysfunctional.

We start by designing an efficient revocation scheme, based on secret sharing. It can remove up to t parties and is secure against coalitions of size t. The performance of this scheme is more efficient than that of previous schemes with the same properties. We then show how to combine the revocation scheme with traitor tracing and self enforcement schemes. 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), and therefore users would be 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 blacklisting broadcast encryption tracing traitors self enforcement copyright protection 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Moni Naor
    • 1
  • Benny Pinkas
    • 1
  1. 1.Dept. Computer Science and Applied MathWeizmann Institute of ScienceRehovotIsrael

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