| 基于Pairing抗选择密文攻击的新门限密码体制 |
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| 引用本文： | 梅其祥,何大可,郑宇. 基于Pairing抗选择密文攻击的新门限密码体制[J]. 西南交通大学学报, 2005, 40(6): 727-730 |
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| 作者姓名： | 梅其祥 何大可 郑宇 |
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| 作者单位： | 1. 西南交通大学信息科学与技术学院,四川,成都,610031;中国科学院研究生院信息安全国家重点实验室,北京,100039;中南大学信息工程学院,湖南,长沙,410075
2. 西南交通大学信息科学与技术学院,四川,成都,610031 |
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| 基金项目： | 国防科技重点实验室资助项目(51436050404QT2202) |
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| 摘 要： | 为提高Baek-Zheng方案的解密效率,用逆运算代替Baek-Zheng方案中所用的点乘运算设计验证过程.由于验证过程只需1次Pairing操作,故在保持Baek-Zheng方案的加密速度以及密文和解密碎片的长度的前提下,新方案将每个门限解密参与者的效率提高了近1倍.新方案在O rac le D iffie-Hellm an假设下被证明可以抗选择密文攻击.
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| 关 键 词： | 选择密文攻击 门限密码体制 Oracle Diffie-Hellman假设 方案 |
| 文章编号： | 0258-2724（2005）06-0727-04 |
| 收稿时间： | 2004-12-08 |
| 修稿时间： | 2004-12-08 |
New Threshold Cryptosystem against Chosen Ciphertext Attacks Based on Pairing |
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| MEI Qi-xiang,HE Da-ke,ZHENG Yu. New Threshold Cryptosystem against Chosen Ciphertext Attacks Based on Pairing[J]. Journal of Southwest Jiaotong University, 2005, 40(6): 727-730 |
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| Authors: | MEI Qi-xiang HE Da-ke ZHENG Yu |
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| Abstract: | To improve the decryption efficiency of the Baek-Zheng scheme,a new threshold scheme was proposed based on pairing. In the new scheme,the dot product operation in the Baek-Zheng scheme is replaced by an inversion operation to design the verifying process.Because the verifying process needs only one pairing operation,the efficiency of threshold decryption is increased nearly one time,and the new scheme has the same encryption efficiency and the sizes of the ciphertext or the decryption shares,compared with that in the Baek-Zheng scheme.The new scheme was proved secure against chosen ciphertext attacks under the Oracle-Diffie-Hellman assumption. |
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| Keywords: | chosen ciphertext attacks threshold cryptosystems Oracle Diffie-Hellman assumption scheme |
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