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分析了电子保证邮件的安全要求，并说明传统的基于同时秘密传送的协议不能适用于当前的电子邮件系统，接着提出了一个基于可信第三方的电子保证邮件协议。最后，对该协议进行了简要的安全分析，证明它能够满足这些安全要求。
This paper analyzes the security requirements of e-mail and shows that the traditional protocol based on simultaneous secret transmission can not be applied to current e-mail system, and then proposes a trusted third party based e-mail protocol. Finally, a brief security analysis of the agreement proves that it meets these security requirements.