Certificates are(16)documents attesting to the(17)of a public key to an individual or other entity. They allow verification of t

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问题 Certificates are(16)documents attesting to the(17)of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to(18)someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an(19)date, the name of the CA that issued the certificate, a serial number, and perhaps other information. Most importantly, it contains the digital(20)of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

选项 A、signature
B、mark
C、stamp
D、hypertext

答案A

解析 证书是一种数字(digital)文档,实现了公开密钥与某个人或其他实体的绑定(binding)。当一个人声称一个公开密钥属于他时,人们可以通过证书来验证它事实上就是这个人的公开密钥。证书可以帮助人们阻止一些人用虚假的密钥去冒充(impersonate)别人。在最简单的形式中,证书中应包含一个公开密钥和名字。对于一般应用,证书中还应包含一个到期 (expiration)时间、证书发送者的CA名称、序列号,以及可能的其他信息。最重要的是,证书中包含了证书发行者的签名(signature)。被广泛接受的证书格式是X.509,因此证书可以被任何一个遵守X.509标准的应用程序所读写。
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