本文为美国麻省理工学院（作者：Jason K. Juang）的硕士论文，共90页。
现代密码方案的安全性依赖于对计算能力的限制和某些数学问题（如整数因子分解）难度的假设。本文描述了有限访问模型中的超加密，该模型是一个对拥有无限计算能力的对手提供完全保密和身份验证的系统，但对大型网络（比如互联网）中小部分计算机的窃听能力有限。本文还提出了一种在有限访问模型中实现超加密的方法，讨论了理论系统与实际系统的不同之处，并分析了它们对系统安全性的影响。
The security of modern cryptographicschemes relies on limits on computational power and assumptions about thedifficulty of certain mathematical problems, such as integer factorization.This thesis describes hyper-encryption in the limited access model, a systemthat provides perfect secrecy and authentication against an adversary whopossesses unbounded computational power, but who is limited in the ability toeavesdrop on more than a fraction of computers in a large network, such as theInternet. This thesis also presents an implementation of hyper-encryption inthe limited access model, discusses areas where the theoretical system differsfrom the practical implementation, and analyzes their impact on the security ofthe system.
1 引言
2 项目背景与相关工作
3 理论系统模型与协议
4 具体实现
5 进一步提升与未来工作展望
6 本文贡献
附录A 电子邮件的信息格式
附录B PSN实现的部分源代码
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