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Ai-Jun Ge, Xin-Yi Huang, Cheng Chen, Chuan-Gui Ma, Rui Zhang. Forgeability of Wang-Zhu-Feng-Yau's Attribute-Based Signature with Policy-and-Endorsement Mechanism[J]. Journal of Computer Science and Technology, 2013, 28(4): 743-748. DOI: 10.1007/s11390-013-1372-y
Citation: Ai-Jun Ge, Xin-Yi Huang, Cheng Chen, Chuan-Gui Ma, Rui Zhang. Forgeability of Wang-Zhu-Feng-Yau's Attribute-Based Signature with Policy-and-Endorsement Mechanism[J]. Journal of Computer Science and Technology, 2013, 28(4): 743-748. DOI: 10.1007/s11390-013-1372-y

Forgeability of Wang-Zhu-Feng-Yau's Attribute-Based Signature with Policy-and-Endorsement Mechanism

  • Recently, Wang et al. presented a new construction of attribute-based signature with policy-and-endorsement mechanism. The existential unforgeability of their scheme was claimed to be based on the strong Diffie-Hellman assumption in the random oracle model. Unfortunately, by carefully revisiting the design and security proof of Wang et al.'s scheme, we show that their scheme cannot provide unforgeability, namely, a forger, whose attributes do not satisfy a given signing predicate, can also generate valid signatures. We also point out the flaws in Wang et al.'s proof.
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