Title :
On the Security of a Certificateless Aggregate Signature Scheme
Author_Institution :
Div. of Fusion & Convergence of Math. Sci., Nat. Inst. for Math. Sci., Daejeon, South Korea
fDate :
10/1/2011 12:00:00 AM
Abstract :
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.
Keywords :
digital signatures; public key cryptography; Zhang-Zhang scheme; certificateless aggregate signature scheme; certificateless cryptography; coalition attack; coalition resistance; computational Diffie-Hellman assumption; identity-based cryptosystem; key escrow problem; public key cryptosystem; random oracle model; security requirement; Aggregates; Computational modeling; Mathematical model; Public key; Resistance; Digital signature; certificateless aggregate signature; certificateless signature; coalition attack; identity-based cryptography;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2011.081011.111214