【作者】 杨波；

【导师】 王育民；

【作者基本信息】 西安电子科技大学 ， 密码学， 1999， 博士

【摘要】 保密通信中，存在着两种互相矛盾的要求——用户对通信的保密性要求和政府机构对“可疑分子”监听的要求；如何满足这两种互相矛盾的要求是密钥托管研究的主要内容。将托管机制引入电子现金系统，可在保护合法用户消费的匿名性同时，实现对可疑用户支付的跟踪。本文的研究工作正是围绕这两个主要内容展开的。主要研究工作及成果有：●提出了基于Rabin加密算法的密钥托管体制。●提出了基于Shamir门限方案的密钥托管体制，以及该体制的两种推广。●提出了基于Asmuth-Bloom门限方案的密钥托管体制。●提出了一种新的密钥分拆门限方案及基于此的密钥托管体制。●提出了一种基于密钥分配的密钥托管体制。●提出了网络环境中基于RSA算法的密钥托管体制。●提出了一种基于分割选择技术的新的电子现金系统。●提出了基于Ferguson电子支付系统的托管电子现金系统。●提出了利用Smart卡的托管电子现金系统。●提出了利用电子钱包的托管电子现金系统。更多还原

【Abstract】 In the domain of private communication, there are likely to be two contradictory requirements. On the one hand users want to communicate securely with other users, and on the other hand governments have requirements to intercept suspected user traffic. It is a main research objection to key escrow proposals how to meet the needs of both users and governments. The electronic cash systems, by incorporating the key escrow mechanism into, can realize traceability to suspected users?payment, while protecting the lawful users? privacy. The two aspects of key escrow and escrowed electronic cash system are studied and the main research results are as follows: ? Propose a key escrow system based on Rabin encryption algorithm. ? Propose a key escrow system based on Shaniir threshold scheme, and give two generalizations to this system. ? Propose a key escrow system based on Asmuth-Bloom threshold scheme. ? Propose a new secret sharing threshold scheme and a key escrow system based on it. ? Propose a key escrow system based on key distribution scheme. ? Propose a key escrow system based on RSA algorithm in a network environment. ? Propose a new electronic cash system based on cut-and-choose technique. ? Propose an escrowed electronic cash system based on Ferguson抯 electronic payment system. ? Propose an escrowed electronic cash system by smart card. ? Propose an escrowed electronic cash system by electronic wallet.更多还原