Threshold public key cryptosystem for encrypting long messages

被引：0
|
作者：
Yang, Guang [1 ]
Liu, Jiqiang [1 ]
机构：
[1] Computer and Information Technology Department, Beijing Jiaotong University, Beijing
来源：
Journal of Computational Information Systems | 2015年 / 11卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Computational Diffie-Hellman problem; Long messages; Semantic security; Threshold cryptosystem;
D O I：
10.12733/jcis13082
中图分类号：
学科分类号：
摘要：
In this paper, we give two schemes of threshold public key cryptosystem for encrypting long messages. Both of our cryptosystems are highly efficient: for each participant, the first scheme in semi-honest model only needs a modular exponentiation operation and the second scheme needs three modular exponentiation operations. Furthermore, we give a variant of definition of semantic security for encrypting long messages to show that our cryptosystem is semantically secure if the CDH assumption holds. 1553-9105/Copyright © 2015 Binary Information Press
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收藏
页码：671 / 681
页数：10
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