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利用双线性对理论和可验证的秘密分享技术,提出了一种新的具有已知签名者的门限代理签名方案.该方案通过在门限代理签名中引入实际参与签名的t个代理签名人的身份标志集合,解决了原有方案中门限代理签名方案中不具备强可识别性的问题;并利用双线性对的优点,克服了同类方案中存在的不能抵抗联合攻击和原始签名人伪造攻击等安全漏洞.结果表明:与同类方案相比,新方案的运算效率约提高20%,签名长度约缩短25%. 相似文献
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This paper proposes a scheme for secure authentication of classical
messages with single photons and a hashed function. The security
analysis of this scheme is also given, which shows that anyone
cannot forge valid message authentication codes (MACs). In addition,
the lengths of the authentication key and the MACs are invariable
and shorter, in comparison with those presented authentication
schemes. Moreover, quantum data storage and entanglement are not
required in this scheme. Therefore, this scheme is more efficient
and economical. 相似文献
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基于cluster态具有较强的纠缠顽固性,提出两个利用四粒子cluster态传送任意单粒子态的量子信息共享方案.第一个方案中发送者Alice、控制者Charlie和接收者Bob共享一个四粒子纠缠态,首先Alice对自己拥有的粒子执行一个三粒子Von-Neumann联合测量,然后Charlie对其拥有粒子执行Z基测量,最后Bob根据发送者和控制者的测量结果,对所拥有的粒子做适当的幺正变换,就能重建共享的单粒子任意态.第二个方案利用一个辅助粒子,发送者Alice、控制者Charlie只需做Bell基测量,Bob通过比特位翻转和幺正变换即可得到Alice传送的量子态.与已有方案相比,两方案信息共享的成功概率为100%,且只需四粒子cluster态为载体,可在目前实验室技术条件下实现. 相似文献
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We propose a new scheme for controlled quantum teleportation with Bell states in which classical keys for controllers’ portion are used. We also discuss the security of the proposed scheme and show that it can satisfy the requirements for controlled quantum teleportation. The comparison between this scheme and the previous ones shows that it is more economical and efficient. 相似文献
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We present a new fair blind signature scheme based on the
fundamental properties of quantum mechanics. In addition, we analyse
the security of this scheme, and show that it is not possible to
forge valid blind signatures. Moreover, comparisons between this
scheme and public key blind signature schemes are also discussed. 相似文献
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