> 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/ko/the-protocol/feature-tls.md).

# TLS 1.3

QUIC에서 사용하는 전송 보안은 TLS 1.3([RFC 8446](https://tools.ietf.org/html/rfc8446))이며 암호화하지 않은 QUIC 연결은 절대로 존재하지 않는다.

이전 버전의 TLS와 비교해서 TLS 1.3에 몇몇 장점이 있지만 QUIC이 TLS 1.3을 사용한 주된 이유는 핸드쉐이크에 더 적은 라운드 트립이 필요하도록 바뀌었기 때문이다. 이는 프로토콜 지연을 줄여준다.

QUIC의 Google 레거시 버전은 커스텀 암호화를 사용했다.


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