Similarly, CA2 can generate a certificate (cert1.1) containing the public key of CA1 so that user certificates existing in PKI 1 (like "User 1") are trusted by PKI 2.
CA2也可以生成类似的包含有CA1公钥的证书cert1.1，以便PKI1的用户(比如User 1)的证书能在PKI2得到认证。