| 两个自认证签密方案的安全性分析 |
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| 引用本文： | 王云.两个自认证签密方案的安全性分析[J].绵阳师范高等专科学校学报,2014(8):100-103. |
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| 作者姓名： | 王云 |
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| 作者单位： | 青海大学成人教育学院,西宁810001 |
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| 摘 要： | 由于自认证签密能同时完成认证和加密两项功能，是实现网络信息安全、快捷传送的理想方式。设计高效、安全的自认证签密方案尤为重要。通过对王之仓等《基于离散对数问题的自认证签密方案》《计算机应用与软件》（第27卷第十期）和俞惠芳等《基于椭圆曲线的自认证签密方案》《微计算机信息》（第26卷第1-3期）的分析研究，发现：这两个签密方案都存在不同程度的安全危害。即：存在已知明文与密文对的伪造攻击，使得第三方均可借助窃取到的明文与密文对假冒发送方伪造任意消息的签名。进而对第一个方案提出改进，通过改变随机数的加入方法，有效克服了原方案的安全隐患，提高了原方案的安全性能。
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| 关 键 词： | 自认证公钥密码学 自认证签密 离散对数 攻击 |
Security Analysis of Two Self-certified Signcryption Schemes |
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| WANG Yun.Security Analysis of Two Self-certified Signcryption Schemes[J].Journal of Mianyang Teachers College,2014(8):100-103. |
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| Authors: | WANG Yun |
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| Institution: | WANG Yun ( College of Aduh Education, Qinghai University, Xining, Qinghai 810001 ) |
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| Abstract: | By integrating the self-certified public key technique and signcryption system,this makes both digital signature and encryption simultaneously in a fitted logical procedure and eliminates certificate management problem and key escrow problem. There are lower computational costs and a higher empty. So it is important for us to construct secure and efficient self-certified signcryption schemes. Analysis of Yu and Wang′s article shows that they are not secure. Because the third can forge signature instead of the true signer with a pair of clear text and cipher text. The improved scheme overcomes their disadvantages and also retains the merits of the original sig-nature schemes by rooting a random number in the digital signature scheme. |
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| Keywords: | self-certified public key self-certified signcryption discrete logarithm problem attack |
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