Abstract
Recently,Zhang Yu-lei et al.proposed an efficient certificateless signature scheme based on bilinear parings.By analyzing the security of the Certificateless Signature(CLS)scheme proposed by Zhang et al.,the authors pointed out that their scheme was insecure against public key replacement attack.An improved scheme was proposed.In random oracle model,the improved scheme was existentially unforgeable under q-Strong Diffie-Hellman(q-SDH)assumption and discrete logarithm assumption.
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