下列（ ）不能提供应用层安全。
- A.S-HTTP
- B.PGP
- C.MIME
- D.SET
正确答案及解析
正确答案
解析
安全超文本传输协议S-HTTP在应用层，它是HTTP协议的扩展，它仅适用于HTTP联结上，S-HTTP可提供通信保密、身份识别、可信赖的信息传输服务及数字签名等。
PGP是1995年开发出的，是一个完整的电子邮件安全软件包，包括加密、鉴别、电子签名和压缩等技术。PGP工作原理并不复杂。提供电子邮件的安全性、发送发鉴别和报文完整性功能。
MIME意为多目Internet邮件扩展，它设计的最初目的是为了在发送电子邮件时附加多媒体数据，让邮件客户程序能根据其类型进行处理。
SET协议是专为在因特网上进行安全信用卡交易的协议，最初是由两个著名的信用卡公司VISA和MasterCard开发的。但是在SET交易中客户端要使用专门的软件（浏览器钱包），同时商家要支付的费用要比使用SSL更加昂贵，所以SET在市场竞争中失败了。
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