CA即证书管理机构，受委托发放数字证书的第三方组织或公司。数字证书是用来建立数字签名和公-私(public-private)密钥对的。CA在这个过程中所起的作用就是保证获得这一独特证书的人就是被授权者本人。在数据安全和电子商务中，CA是一个非常重要的组成部分，因为它们确保信息交换各方的身份。
查看通信百科中关于“CA”的定义
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