| 摘要: |
| 为了避免复杂的双线性对运算和提高签密机制的性能,Liu等人提出了一种不使用双线性对的无证书签密机制.同时,随机谕示模型下证明了机制是可证安全.通过给出具体的攻击算法,证明了Liu等人所提出的机制不能抵抗类型1敌手的攻击.为了抵抗这种攻击,给出了一种有效的方法. |
| 关键词: 签密 无证书 随机谕示模型 椭圆曲线 |
| DOI：10.3724/SP.J.1001.2013.04245 |
| 分类号: |
| 基金项目:高等学校博士学科点专项科研基金(20110141120003) |
|
| Security Analysis of a Certificateless Signcryption Scheme |
|
HE De-Biao
|
|
School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China
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| Abstract: |
| To avoid complicated pairing operation and improve performance, Liu, et al. proposed a pairing-free certificateless signcryption scheme, and claims that their scheme is provably secure in a strengthened security model. Unfortunately, by giving concrete attacks, the sutdy indicates that Liu's et al. certificateless signcryption scheme is not secure in this strengthened security model. To solve the problem, an efficient countermeasure is also proposed. |
| Key words: signcryption certificateless random oracle model elliptic curve |
