Publication Details

Guo, F., Mu, Y. & Susilo, W. (2012). Identity-based traitor tracing with short private key and short ciphertext. In S. Foresti, M. Young & F. Martinelli (Eds.), 17th European Symposium on Research in Computer Security, ESORICS 2012 (pp. 609-626). Germany: Springer-Verlag.


Identity-based traitor tracing (IBTT) scheme can be utilized to identify a private (decryption) key of any identity that is illegally used in an identity-based broadcast encryption scheme. In PKC'07, Abdalla et al. proposed the first IBTT construction with short private key. In CCS'08, Boneh and Naor proposed a public-key traitor tracing, which can be extended to IBTT with short ciphertext. With a further exploration, in this paper, we propose the first IBTT with short private key and short ciphertext. Private key and ciphertext are both order of O(l 1+l 2), where l 1 is the bit length of codeword of fingerprint codes and l 2 is the bit length of group element. To present our IBTT scheme, we introduce a new primitive called identity-based set encryption (IBSE), and then describe our IBTT scheme from IBSE and fingerprint codes based on the Boneh-Naor paradigm. Our IBSE scheme is provably secure in the random oracle model under the variant of q-BDHE assumption.



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