下面可提供安全电子邮件服务的是( )。
- A.RSA
- B.SSL
- C.SET
- D.S/MIME
正确答案及解析
正确答案
解析
MIME(MultipurposeInternetMailExtensions)中文名为:多用途互联网邮件扩展类型。Internet电子邮件由一个邮件头部和一个可选的邮件主体组成,其中邮件头部含有邮件的发送方和接收方的有关信息。而MIME是针对邮件主体的一种扩展描述机制。它设定某种扩展名的文件用一种应用程序来打开的方式类型,当该扩展名文件被访问的时候,浏览器会自动使用指定应用程序来打开。多用于指定一些客户端自定义的文件名,以及一些媒体文件打开方式。所以这是与邮件内容直接相关的一个协议。而S/MIME(SecureMultipurposeInternetMailExtensions)是对MIME在安全方面的扩展。它可以把MIME实体(比如数字签名和加密信息等)封装成安全对象。增强安全服务,例如具有接收方确认签收的功能,这样就可以确保接收者不能否认已经收到过的邮件。还可以用于提供数据保密、完整性保护、认证和鉴定服务等功能。S/MIME只保护邮件的邮件主体,对头部信息则不进行加密,以便让邮件成功地在发送者和接收者的网关之间传递。
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