The following errata report has been held for document update 
for RFC8446, "The Transport Layer Security (TLS) Protocol Version 1.3". 

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid6140

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Status: Held for Document Update
Type: Technical

Reported by: Ben Smyth <resea...@bensmyth.com>
Date Reported: 2020-04-29
Held by: Paul Wouters (IESG)

Section: 4.4.2.2.

Original Text
-------------
This fallback chain SHOULD NOT use the deprecated SHA-1 hash
algorithm in general, but MAY do so if the client's advertisement
permits it, and MUST NOT do so otherwise.

Corrected Text
--------------
This fullback chain MUST NOT use the deprecated SHA-1 hash,
except if advertised by the client, in which case it MAY.

Notes
-----
The original text is difficult to read, eliminating the unnecessary "SHOULD 
NOT" seems to make it 
easier.

Paul Wouters(SEC AD): accepted with slightly different text, keeping the SHOULD 
NOT -> MUST NOT change proposed here

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RFC8446 (draft-ietf-tls-tls13-28)
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Title               : The Transport Layer Security (TLS) Protocol Version 1.3
Publication Date    : August 2018
Author(s)           : E. Rescorla
Category            : PROPOSED STANDARD
Source              : Transport Layer Security
Stream              : IETF
Verifying Party     : IESG

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