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Erschienen in:
2012 | OriginalPaper | Buchkapitel
Identity-Based Traitor Tracing with Short Private Key and Short Ciphertext
verfasst von : Fuchun Guo, Yi Mu, Willy Susilo
Erschienen in: Computer Security – ESORICS 2012
Verlag: Springer Berlin Heidelberg
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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.