Security Analysis of the Unrestricted Identity-Based Aggregate Signature Scheme

Kwangsu Lee and Dong Hoon Lee

PLOS ONE, 2015, vol. 10, issue 5, 1-8

Abstract: Aggregate signatures allow anyone to combine different signatures signed by different signers on different messages into a short signature. An ideal aggregate signature scheme is an identity-based aggregate signature (IBAS) scheme that supports full aggregation since it can reduce the total transmitted data by using an identity string as a public key and anyone can freely aggregate different signatures. Constructing a secure IBAS scheme that supports full aggregation in bilinear maps is an important open problem. Recently, Yuan et al. proposed such a scheme and claimed its security in the random oracle model under the computational Diffie-Hellman assumption. In this paper, we show that there is an efficient forgery on their IBAS scheme and that their security proof has a serious flaw.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0128081

DOI: 10.1371/journal.pone.0128081

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