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On the Security of a Certificateless Aggregate Signature Scheme

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1 Author(s)
Kyung-Ah Shim ; Div. of Fusion & Convergence of Math. Sci., Nat. Inst. for Math. Sci., Daejeon, South Korea

Certificateless cryptography eliminates the need of certificates in public key cryptosystems and solves the inherent key escrow problem in identity-based cryptosystems. An aggregate signature scheme is a signature scheme which allows to aggregate n signatures on n distinct messages from n distinct users into a single signature. Recently, Zhang and Zhang proposed a certificateless aggregate signature scheme provably secure in the random oracle model under the Computational Diffie-Hellman assumption. In this paper, we propose a novel fundamental security requirement for certificateless aggregate signature schemes, called coalition resistance, by presenting coalition attacks on Zhang-Zhang's scheme.

Published in:

Communications Letters, IEEE  (Volume:15 ,  Issue: 10 )