In practice, it is a system of digital certificates, certification authorities, and other registration authorities that verify and authenticate the validity of each party involved in an electronic transaction.

• 实际上,PKI是一个由数字证书、证书颁发机构以及其他对电子事务中所涉及到的每一方的合法性进行检验和身份验证的注册授权机构所组成的系统。