rfc8999v3.txt   rfc8999.txt 
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a Version Negotiation packet if it attempts a different QUIC version a Version Negotiation packet if it attempts a different QUIC version
as a result. as a result.
8. References 8. References
8.1. Normative References 8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
8.2. Informative References 8.2. Informative References
[QUIC-TLS] Thomson, M., Ed. and S. Turner, Ed., "Using Transport [QUIC-TLS] Thomson, M., Ed. and S. Turner, Ed., "Using TLS to Secure
Layer Security (TLS) to Secure QUIC", RFC 9001, QUIC", RFC 9001, DOI 10.17487/RFC9001, May 2021,
DOI 10.17487/RFC9001, May 2021, <https://www.rfc-editor.org/info/rfc9001>.
<https://www.rfc-editor.org/rfc/rfc9001>.
[QUIC-TRANSPORT] [QUIC-TRANSPORT]
Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
Multiplexed and Secure Transport", RFC 9000, Multiplexed and Secure Transport", RFC 9000,
DOI 10.17487/RFC9000, May 2021, DOI 10.17487/RFC9000, May 2021,
<https://www.rfc-editor.org/rfc/rfc9000>. <https://www.rfc-editor.org/info/rfc9000>.
[RFC5116] McGrew, D., "An Interface and Algorithms for Authenticated [RFC5116] McGrew, D., "An Interface and Algorithms for Authenticated
Encryption", RFC 5116, DOI 10.17487/RFC5116, January 2008, Encryption", RFC 5116, DOI 10.17487/RFC5116, January 2008,
<https://www.rfc-editor.org/rfc/rfc5116>. <https://www.rfc-editor.org/info/rfc5116>.
Appendix A. Incorrect Assumptions Appendix A. Incorrect Assumptions
There are several traits of QUIC version 1 [QUIC-TRANSPORT] that are There are several traits of QUIC version 1 [QUIC-TRANSPORT] that are
not protected from observation but are nonetheless considered to be not protected from observation but are nonetheless considered to be
changeable when a new version is deployed. changeable when a new version is deployed.
This section lists a sampling of incorrect assumptions that might be This section lists a sampling of incorrect assumptions that might be
made about QUIC based on knowledge of QUIC version 1. Some of these made about QUIC based on knowledge of QUIC version 1. Some of these
statements are not even true for QUIC version 1. This is not an statements are not even true for QUIC version 1. This is not an
exhaustive list; it is intended to be illustrative only. exhaustive list; it is intended to be illustrative only.
*Any and all of the following statements can be false for a given *Any and all of the following statements can be false for a given
QUIC version:* QUIC version:*
* QUIC uses TLS [QUIC-TLS] and some TLS messages are visible on the * QUIC uses TLS [QUIC-TLS], and some TLS messages are visible on the
wire. wire.
* QUIC long headers are only exchanged during connection * QUIC long headers are only exchanged during connection
establishment. establishment.
* Every flow on a given 5-tuple will include a connection * Every flow on a given 5-tuple will include a connection
establishment phase. establishment phase.
* The first packets exchanged on a flow use the long header. * The first packets exchanged on a flow use the long header.
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