CloudFlare 的 Keyless SSL 服務

CloudFlare 有兩篇公告出來:「Announcing Keyless SSL™: All the Benefits of CloudFlare Without Having to Turn Over Your Private SSL Keys」、「Keyless SSL: The Nitty Gritty Technical Details」。前面的一篇偏向公告文 (以及公關稿),而後面的一篇提到了實際運作的方式。

用兩張 Keyless SSL 的 flow 就可以知道差異了,一張是 RSA-based,一張是 DH-based:

把與 private key 相關的運算拆出來,由後方計算完成後再計算出 session key 與 client 溝通。如此一來,雖然速度比較慢,但 private key 管理在客戶自己手上...

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