Subject: [CFRG] [Errata Rejected] RFC7748 (5568)

From: RFC Errata System <[email-masked]>
Date: Mon, 14 Dec 2020 23:02:25 -0800 (PST)

The following errata report has been rejected for RFC7748,
"Elliptic Curves for Security".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid5568

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Status: Rejected
Type: Technical

Reported by: Juan Alcasabas <[email-masked]>
Date Reported: 2018-12-07
Rejected by: Stanislav Smyshlyaev (IRSG)

Section: 5.2

Original Text
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   Input u-coordinate:
     e5210f12786811d3f4b7959d0538ae2c31dbe7106fc03c3efc4cd549c715a493

Corrected Text
--------------
   Input u-coordinate:
     e5210f12786811d3f4b7959d0538ae2c31dbe7106fc03c3efc4cd549c715a413

Notes
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In the X25519 2nd test vector the last byte of input u-coordinate should be 13 instead of 93. This will fix inconsistency between u-coordinate, its base10 representation and the output u-coordinate.
 --VERIFIER NOTES-- 
A change of one bit of the input u-coordinate in the hexadecimal representation is proposed (to make it "consistent" with the base 10 representation). However, implementations of x25519 should "mask" that bit after taking a u-coordinate as an input - therefore, the existing text of RFC does not have any errors there. 

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RFC7748 (draft-irtf-cfrg-curves-11)
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Title               : Elliptic Curves for Security
Publication Date    : January 2016
Author(s)           : A. Langley, M. Hamburg, S. Turner
Category            : INFORMATIONAL
Source              : Crypto Forum Research Group
Area                : N/A
Stream              : IRTF
Verifying Party     : IRSG