At this point, you may be asking why PRF is part of WebAuthn in the first place.
（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。
。关于这个话题，safew官方下载提供了深入分析
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