rfc9849v7.txt   rfc9849.txt 
Internet Engineering Task Force (IETF) E. Rescorla Internet Engineering Task Force (IETF) E. Rescorla
Request for Comments: 9849 Independent Request for Comments: 9849 Independent
Category: Standards Track 奥 一穂 (K. Oku) Category: Standards Track 奥 一穂 (K. Oku)
ISSN: 2070-1721 Fastly ISSN: 2070-1721 Fastly
N. Sullivan N. Sullivan
Cryptography Consulting LLC Cryptography Consulting LLC
C. A. Wood C. A. Wood
Apple Apple
February 2026 March 2026
TLS Encrypted Client Hello TLS Encrypted Client Hello
Abstract Abstract
This document describes a mechanism in Transport Layer Security (TLS) This document describes a mechanism in Transport Layer Security (TLS)
for encrypting a ClientHello message under a server public key. for encrypting a ClientHello message under a server public key.
Status of This Memo Status of This Memo
skipping to change at line 2291 skipping to change at line 2291
DOI 10.17487/RFC8744, July 2020, DOI 10.17487/RFC8744, July 2020,
<https://www.rfc-editor.org/info/rfc8744>. <https://www.rfc-editor.org/info/rfc8744>.
[RFC9250] Huitema, C., Dickinson, S., and A. Mankin, "DNS over [RFC9250] Huitema, C., Dickinson, S., and A. Mankin, "DNS over
Dedicated QUIC Connections", RFC 9250, Dedicated QUIC Connections", RFC 9250,
DOI 10.17487/RFC9250, May 2022, DOI 10.17487/RFC9250, May 2022,
<https://www.rfc-editor.org/info/rfc9250>. <https://www.rfc-editor.org/info/rfc9250>.
[RFC9848] Schwartz, B., Bishop, M., and E. Nygren, "Bootstrapping [RFC9848] Schwartz, B., Bishop, M., and E. Nygren, "Bootstrapping
TLS Encrypted ClientHello with DNS Service Bindings", TLS Encrypted ClientHello with DNS Service Bindings",
RFC 9848, DOI 10.17487/RFC9848, February 2026, RFC 9848, DOI 10.17487/RFC9848, March 2026,
<https://www.rfc-editor.org/info/rfc9848>. <https://www.rfc-editor.org/info/rfc9848>.
[WHATWG-IPV4] [WHATWG-IPV4]
WHATWG, "URL - IPv4 Parser", WHATWG Living Standard, May WHATWG, "URL - IPv4 Parser", WHATWG Living Standard, May
2021, <https://url.spec.whatwg.org/>. Commit snapshot: 2021, <https://url.spec.whatwg.org/>. Commit snapshot:
<https://url.spec.whatwg.org/commit- <https://url.spec.whatwg.org/commit-
snapshots/1b8b8c55eb4bed9f139c9a439fb1c1bf5566b619/#concept- snapshots/1b8b8c55eb4bed9f139c9a439fb1c1bf5566b619/#concept-
ipv4-parser>. ipv4-parser>.
Appendix A. Linear-Time Outer Extension Processing Appendix A. Linear-Time Outer Extension Processing
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