属性撤销的密文策略属性基加密及其应用研究

发布时间：2018-04-23 12:19

本文选题：密文策略属性基加密 + 属性撤销　；参考：《南京邮电大学》2017年硕士论文

【摘要】：迅速发展的物联网、大数据、云计算等新技术不断深入到学习、工作、生活等各个领域,随之带来的安全问题和困难挑战也逐渐增多,传统的密码学技术已经不能完全满足人们在不同应用场景下使用的需要,于是现代密码学技术要求不断改进和创新。本文从个人健康记录系统面临的实际应用需求出发,侧重对密文策略属性基加密方案加以分析与研究,旨在解决属性撤销、外包解密、权重属性等方面的问题。主要成果如下:(1)通过对诸多密文策略属性基加密方案的成果进行汇总与分析,从中选取了Waters提出的一个高效的加密方案,采纳Ibraimi等人提出的基于中间人的算法思想,提出一个新的基于中间人的密文策略属性基加密方案,使得该方案同时兼有属性撤销和外包解密的功能。该方案中中间人担任很重要的角色:一方面,它可以帮助检测用户属性的合法性,实现属性的撤销;另一方面,它可以协助完成大部分解密运算,使得用户端达到轻量级计算。它的安全性证明是基于选择明文攻击的,并且应用在个人健康记录系统中较于其他方案有着更大的优势。(2)借鉴Hur等人提出的密钥加密密钥树的性质和马华等人提出的密文更新和密钥更新的算法,并引进刘西蒙等人首次提出的权重属性的概念,对上面提出的密文策略属性基加密方案进一步改进。改进后的方案不仅可以保留已有功能,而且可以支持更加细粒度和及时性的属性撤销以及良好的体现出属性的不同权重,更加适合个人健康记录系统。
[Abstract]:With the rapid development of the Internet of things, big data, cloud computing and other new technologies continue to penetrate into various fields, such as learning, work, life and so on. With this, the security problems and difficult challenges are also gradually increasing. Traditional cryptography technology can not fully meet the needs of people in different application scenarios, so modern cryptography technology needs to be improved and innovated. Based on the practical application requirements of personal health record system, this paper focuses on the analysis and research of ciphertext policy attribute base encryption scheme, aiming at solving the problems of attribute revocation, outsourcing decryption, weight attribute and so on. The main results are as follows: 1) by summarizing and analyzing the achievements of many ciphertext policy attribute based encryption schemes, we select an efficient encryption scheme proposed by Waters, and adopt the idea of middleman based algorithm proposed by Ibraimi et al. A new ciphertext policy attribute-base encryption scheme based on middleman is proposed, which makes the scheme have the functions of both attribute revocation and outsourcing decryption. The middleman plays a very important role in this scheme: on the one hand, it can help to detect the legitimacy of user attributes and realize the revocation of attributes; on the other hand, it can help to complete most decryption operations and make the client achieve lightweight computing. Its security is proven to be based on selective plaintext attacks, And the application in the personal health record system has more advantages than other schemes. (2) referring to the properties of key encryption key tree proposed by Hur et al and the ciphertext updating and key updating algorithm proposed by Ma Hua et al. The concept of weight attribute proposed by Liu Simon et al is introduced to further improve the encryption scheme of ciphertext policy attribute base proposed above. The improved scheme can not only retain the existing functions, but also support finer granularity and timeliness of attribute revocation and better reflect the different weights of attributes, which is more suitable for personal health record system.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN918.4

【参考文献】