Cryptology ePrint Archive: Report 2015/1051

Cryptanalysis and Improvement of Identity-based Proxy Multi-signature scheme

Jayaprakash Kar

Abstract: Cao-Cao’s recently proposed an identity-based proxy signature scheme and claim that the scheme is provably secure in random oracle model. In this paper we have reviewed the scheme and proven that the scheme is vulnerable to chosen message attack under the defined security model. To prevent this attack, we propose an improved version of the scheme. A Proxy multi-signature scheme allows an authorized proxy signer to sign on a message on behalf of a group of original signers.

Category / Keywords: cryptographic protocols /

Date: received 29 Oct 2015

Contact author: jayaprakashkar at yahoo com

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Version: 20151030:193138 (All versions of this report)

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