只有使用受信任的签署方发放的证书才能发起此攻击。
You can only use certificates issued by trusted signers to execute this attack.
其它方法使用中央认证中心来发放证书，这些证书保证了网络中从一点到另一点的安全通信。
Other approaches use a central certificate authority to issue certificates that guarantee secure communication from one point to another within a network.
截止2007年12月底，至少951486项ISO 9001： 2000证书在175个国家和地区发放。
Up to the end of December 2007, at least 951 486 ISO 9001:2000 certificates had been issued in 175 countries and economies.
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