An Improved Identity-Based Multi-Proxy Multi-Signature Scheme
نویسندگان
چکیده
In a multi-proxy multi-signature scheme, a group of original signers can delegate the signing rights to a group of proxy signers. All proxy signers cooperatively sign messages on behalf of the original group. Recently, Sahu and Padhye proposed an identity-based multi-proxy multi-signature (IBMPMS) scheme which was claimed to be secure against existential forgery on adaptive chosen-message and adaptive chosenidentity attacks in the random oracle model. However, in this paper, we indicate that Sahu-Padhye’s scheme is insecure by giving concrete attacks. In the end, we propose a new IBMPMS scheme and prove that it is secure in the random oracle model.
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تاریخ انتشار 2016