International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Fully Collusion Resistant Traitor Tracing

Dan Boneh
Amit Sahai
Brent Waters
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Abstract: We construct the first fully collusion resistant tracing traitors system with sublinear size ciphertexts and constant size private keys. More precisely, let $N$ be the total number of users. Our system generates ciphertexts of size $O(\sqrt{N})$ and private keys of size $O(1)$. We build our system by first building a simpler primitive called private linear broadcast encryption (PLBE). We then show that any PLBE gives a tracing traitors system with the same parameters. Our system uses bilinear maps in groups of composite order.
  title={Fully Collusion Resistant Traitor Tracing},
  booktitle={IACR Eprint archive},
  keywords={traitor tracing},
  note={ 13284 received 9 Feb 2006, last revised 16 May 2006},
  author={Dan Boneh and Amit Sahai and Brent Waters},