为了适应高校新的培养和管理模式,设计了基于校园网的试卷分析系统。在该系统中,成绩和试卷分析内容的录入,由教师登录到试卷分析管理系统直接录入,然后加上数字签名,有效地防止了非法用户录入或者修改试卷分析的内容以及学生的成绩。...为了适应高校新的培养和管理模式,设计了基于校园网的试卷分析系统。在该系统中,成绩和试卷分析内容的录入,由教师登录到试卷分析管理系统直接录入,然后加上数字签名,有效地防止了非法用户录入或者修改试卷分析的内容以及学生的成绩。由于椭圆曲线离散对数问题具有抗攻击性强、计算量小、处理速度快等优点,因此本文中的数字签名采用基于椭圆曲线的EC D SA协议,提高了系统的效率和安全性。展开更多
斯诺登事件揭露了某些密码体制的确存在被颠覆的事实.椭圆曲线数字签名算法(elliptic curve digital signature algorithm,ECDSA)在同等安全强度下,因其签名长度短而被广泛应用,如被用于比特币交易单的签名.ECDSA签名算法是否会被颠覆...斯诺登事件揭露了某些密码体制的确存在被颠覆的事实.椭圆曲线数字签名算法(elliptic curve digital signature algorithm,ECDSA)在同等安全强度下,因其签名长度短而被广泛应用,如被用于比特币交易单的签名.ECDSA签名算法是否会被颠覆且存在修复方法仍是一个挑战.正面回答了这一问题:首先利用伪随机函数(pseudorandom function,PRF)计算k替换ECDSA签名中使用的随机数k,实现了对ECDSA签名的颠覆,使得敌手只需获得至多3个连续签名就能够提取出签名私钥;然后,将签名私钥、签名消息与其他随机签名组件的哈希值作为签名算法的第2个随机数,对ECDSA签名进行了改进,提出了抗颠覆攻击的ECDSA签名,即使敌手替换新签名算法的某个组件,也无法提取签名私钥的任何信息;最后,对提出的算法与已有算法进行了效率测试,实验结果证明了提出的算法在计算复杂度与算法执行效率方面都具备优势.展开更多
Wired equivalent security is difficult to provide in wireless networks due to high dynamics, wireless link vulnerability, and decentralization. The Elliptic Curve Digital Signature Algorithm（ECDSA） has been applied ...Wired equivalent security is difficult to provide in wireless networks due to high dynamics, wireless link vulnerability, and decentralization. The Elliptic Curve Digital Signature Algorithm（ECDSA） has been applied to wireless networks because of its low computational cost and short key size, which reduces the overheads in a wireless environment. This study improves the ECDSA scheme by reducing its time complexity. The significant advantage of the algorithm is that our new scheme needs not to calculate modular inverse operation in the phases of signature generation and signature verification. Such an improvement makes the proposed scheme more efficient and secure.展开更多
文摘为了适应高校新的培养和管理模式,设计了基于校园网的试卷分析系统。在该系统中,成绩和试卷分析内容的录入,由教师登录到试卷分析管理系统直接录入,然后加上数字签名,有效地防止了非法用户录入或者修改试卷分析的内容以及学生的成绩。由于椭圆曲线离散对数问题具有抗攻击性强、计算量小、处理速度快等优点,因此本文中的数字签名采用基于椭圆曲线的EC D SA协议,提高了系统的效率和安全性。
基金Supported by the Science Foundation of Aeronau-tics (05F53029)Graduate Starting Seed Fund of NorthwesternPolytechnical University (Z200633)
文摘Wired equivalent security is difficult to provide in wireless networks due to high dynamics, wireless link vulnerability, and decentralization. The Elliptic Curve Digital Signature Algorithm（ECDSA） has been applied to wireless networks because of its low computational cost and short key size, which reduces the overheads in a wireless environment. This study improves the ECDSA scheme by reducing its time complexity. The significant advantage of the algorithm is that our new scheme needs not to calculate modular inverse operation in the phases of signature generation and signature verification. Such an improvement makes the proposed scheme more efficient and secure.
