> For the complete documentation index, see [llms.txt](https://http3-explained.haxx.se/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://http3-explained.haxx.se/zh-tw/why-quic/why-secure.md).

# 安全性

QUIC 保證安全性。該協定沒有明文版本，要建立一個 QUIC 連接，就必須通過 TLS 1.3 來安全地建立一個加密連接。 如上文所說，加密可以避免協定僵化，流量被攔截或被做其它處理。這讓 QUIC 具有了 Web 用戶所期望及需要的 HTTPS 安全特性。

QUIC 只在加密協定協商之前，有少數幾個以明文發送的初始握手封包。


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