任何时候使用公钥，您都可以确信关联的私钥确实保存在您使用其公钥的对方手里。
Any time you use a public key, you can be sure that the associated private key is indeed owned by the subject whose private key you are using.
作者写道：“广告商必须确信他们广告中的名人确实应该得到他们的地位。”
"Advertisers should make sure that the celebrities they want to use in their ads actually deserve their status," the authors write.
一旦选择了一个提供者，在试验提供者 B 的同时，企业可能继续使用提供者 A，不断比较结果，直到确信提供者（在功能上）确实是等同的。
Once a provider is chosen, an enterprise might continue to use provider A while trying provider B, comparing results until satisfied that the providers are in fact (functionally) equivalent.
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