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中文摘要：
Ju 等。由介绍安全调停人(SEM ) 与即时撤回建议了一个无证书的签名计划机制。这篇文章介绍这个计划的详细 cryptoanalysis 并且证明在他们的建议计划，一旦有效签名被生产了，签名人能恢复他的私人关键信息，即时撤回性质将被损坏。而且，一个改进调停的签名计划，能消除这些劣势，被建议，并且在问题(ECFP ) 假设和假设也是的双线性的计算 diffie-hellman 问题(BCDH ) 建议了的椭圆形的曲线因式分解下面的改进计划的安全证明。
英文摘要：
Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator （SEM） mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem （ECFP） assumption and bilinear computational diffie-hellman problem （BCDH） assumption is also proposed.
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