Before we cover that, let's talk about nonrepudiation.
在讨论这个问题之前，我们先说一说抗抵赖。
This model mainly solve Authentication, Nonrepudiation, Privacy and Integrity existed in the current mail system.
该模型主要解决了邮件系统中存在的身份鉴别、防止抵赖、保密性、完整性等安全问题。
Because nonrepudiation is a direct result of authentication, message encryption also does not provide nonrepudiation.
由于认可是身份验证的直接结果，因此邮件加密也不提供认可。
Because nonrepudiation is a direct result of authentication, message encryption also does not provide nonrepudiation.
由于认可是身份验证的直接结果，因此邮件加密也不提供认可。
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