摘要
近些年,无线医疗传感器网络(Wireless Medicine Sensor Networks,WMSNs)得到了广泛的应用。WMSNs提高了患者护理质量,但同时也存在许多安全隐患。为了保护患者数据的隐私安全,Yi等人提出了一个基于Paillier密码系统的分布式ElGamal密码系统。然而,Rao分析了他们的方案并展示了一种可行的攻击,该攻击允许攻击者获取密钥。因此,是否可以将具有加法同态性质的密码系统修改为安全的分布式解密系统,以实现更简单的分布式密钥生成和更高效的分布式解密仍然是一个挑战。针对上述挑战,该文提出了一种基于Castagnos和Laguillaumie(CL)加密的改进分布式解密系统,并对未知阶群G上的离散对数关系给出了有效的零知识证明。与其他分布式解密系统相比,基于CL加密的改进分布式系统具有良好的性能、更可靠的设置、更高的安全级别。
In recent years,Wireless Medicine Sensor Networks(WMSNs)have been widely used.WMSNs improve the quality of patient care,but also bring many safety danger.In order to protect the privacy of patient data,Yi et al.proposed a distributed ElGamal cryptosystem based on Paillier cryptosystem.However,Rao analyzed their scheme and demonstrated a viable attack that allows an attacker to obtain the key.Therefore,it remains a challenge whether cryptosystems with additive homomorphic properties can be modified into secure distributed cryptosystems for simpler distributed key generation and more efficient distributed decryption.Aiming at the above challenges,we propose an improved distributed decryptosystem based on Castagnos and Laguillaumie(CL)encryption,and give an effective zero-knowledge proof for the discrete logarithm relationship on the unknown order group G.Compared with other distributed cryptosystems,the improved distributed system based on CL encryption has better performance,more reliable setup,and higher security level.
作者
张志莹
王志伟
ZHANG Zhi-ying;WANG Zhi-wei(School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)
出处
《计算机技术与发展》
2024年第5期95-102,共8页
Computer Technology and Development
基金
2022年信息安全国家重点实验室开放课题项目(2022-MS-5)
江苏省研究生科研与创新计划项目(KYCX22_0987)。
关键词
分布式解密系统
加法同态
HSM群
零知识证明
自适应根子群假设
distributed decryption system
additive homomorphism
hard subgroup membership assumption group
zero-knowledge proof
adaptive root subgroup assumption
作者简介
张志莹(1999-),女,硕士,研究方向为密码学;王志伟(1976-),男,教授,研究方向为云/雾计算安全、区块链、密码协议等。
