自从有通信活动以来,安全问题一直受到人们的重视,所以人类发明了封条、签字、密码锁等安全措施和机制来增强通信的安全性。进入互联网时代之后,由于信息在几乎不受保护的情形下在网络间传输、这更加深了使用者对网络的不信任感,相关信息安全技术因此孕育而生。 PKI(Public Key Infrastructure,公匙基础设施)就是广为使用的信息安全技术之一。其原理是通过数学加解密的公式发展而成。利用数学加解密公式可制成两种数字钥匙,其中一种钥匙叫公钥 Since the communication activities, the safety issue has been paid attention to by people. Therefore, human beings have invented the security measures and mechanisms such as seals, signatures and password locks to enhance the communication security. After entering the Internet era, as information is transmitted between networks with little or no protection, it deepens users’ trust in the Internet and the related information security technologies are born. PKI (Public Key Infrastructure) is one of the most widely used information security technologies. The principle is through mathematical encryption and decryption formula developed. Using mathematical encryption and decryption formula can be made of two kinds of digital keys, one of the keys called the public key