Attribute-based signature schemes with accountability
by Yan Ren; Chunming Tang; Guilin Wang; Duncan. S. Wong
International Journal of Information and Communication Technology (IJICT), Vol. 7, No. 2/3, 2015

Abstract: Since attribute-based signature (ABS) was introduced by Guo and Zeng in 2008, considerable researches have investigated this topic. In an ABS scheme, the attribute authority (A-authority) generates the private key for each user, hence, it has to be completely trusted. The A-authority is free to engage in malicious activities without any risk of being confronted in a court of law. Motivated by this, we firstly propose the notion of accountable attribute-based signature schemes in this paper. It is not only a variant of ABS, but also a new approach to mitigate the key escrow problem. Then, we construct two efficient accountable attribute-based signature schemes. Finally, we prove that the new schemes are secure under the computational Diffie-Hellman (CDH) and the modified computational Diffie-Hellman (MCDH) assumptions. Our main goal is to restrict the conditions that the A-authority can misbehave. In our schemes, if the A-authority maliciously generates and distributes a private key, it will run the risk of being caught and prosecuted.

Online publication date: Wed, 01-Apr-2015

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