Contents-certified e-mail delivery systems using the Gradual Secret Exchange Protocol

本研究的目的是开发一个内容认证的电子邮件系统，没有可信的第三方，使用所谓的渐进秘密交换协议。我们首先使用冈本和太田的协议开发了一个电子邮件协议，并实现了它。我们在SAINT 2009上展示了这个结果。然后我们讨论了之前协议的问题，特别是它的高计算复杂性。为了补充这一点，我们改进了协议，在保留安全性的同时简化了以前的协议。我们实现了它并进行了实验，结果表明我们的新系统可以处理大小为30MB的文档。我们在SAINT 2011上展示了这个结果。

The purpose of this research is to develop a contents-certified e-mail system without a trusted third party, using the so-called Gradual Secret Exchange Protocol. We first developed an e-mail protocol using Okamoto and Ohta's protocol, and implemented it. We presented this result at SAINT 2009. We then discussed problems of the previous protocol, particularly on its high computational complexity. To complement this, we improved the protocol, simplifying the previous one while retaining security. We implemented it and conducted experiments, which shows that our new system can treat documents of size up to 30MB. We presented this result at SAINT 2011.