The certificate path of the inner-realm is described in its subject alternative name, and the certificate path of the inter-realm was implemented by its proxy.
用证书主体别名表示信任域内的证书路径，信任域之间的证书路径由各信任域的路径构造代理完成。
This scheme solves all the problems of key escrow and certificate management, and satisfies the security requirements of a proxy ring signature scheme.
该方案没有密钥的托管问题，也不需要管理证书，并且满足代理环签名方案所有的安全性要求。
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