[TLS] [Errata Held for Document Update] RFC7905 (5251)

RFC Errata System <rfc-editor@rfc-editor.org> Mon, 18 March 2024 04:04 UTC

To: xavier.bonnetain@inria.fr, agl@google.com, wtc@google.com, nmav@redhat.com, joachim@secworks.se, simon@josefsson.org
From: RFC Errata System <rfc-editor@rfc-editor.org>
Cc: paul.wouters@aiven.io, iesg@ietf.org, tls@ietf.org, rfc-editor@rfc-editor.org
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Message-Id: <20240318040356.29663202B6@rfcpa.amsl.com>
Date: Sun, 17 Mar 2024 21:03:56 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/f4MmNGJ7_WH14O7Pj6qEg2lZEdw>
Subject: [TLS] [Errata Held for Document Update] RFC7905 (5251)
Precedence: list

The following errata report has been held for document update 
for RFC7905, "ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS)". 

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid5251

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Status: Held for Document Update
Type: Technical

Reported by: Xavier Bonnetain <xavier.bonnetain@inria.fr>
Date Reported: 2018-02-01
Held by: Paul Wouters (IESG)

Section: 4. Security

Original Text
-------------
   Poly1305 is designed to ensure that forged messages are rejected with
   a probability of 1-(n/2^107), where n is the maximum length of the
   input to Poly1305.  In the case of (D)TLS, this means a maximum
   forgery probability of about 1 in 2^93.

Corrected Text
--------------
   Poly1305 is designed to ensure that forged messages are rejected with
   a probability of 1-(n/2^106), where n is the maximum length of the
   input to Poly1305.  In the case of (D)TLS, this means a maximum
   forgery probability of about 1 in 2^92.

Notes
-----
The security claimed on poly1305 is slightly beyond what was proven by the designer (see https://cr.yp.to/mac/poly1305-20050329.pdf), and the trivial forgery attempt with a message of length 1 succeeds with probability 2^{-106}.

Paul Wouters(AD): See https://mailarchive.ietf.org/arch/msg/tls/dBMIsLsaA7XevXpd9hzJ6skMqE4/

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RFC7905 (draft-ietf-tls-chacha20-poly1305-04)
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Title               : ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS)
Publication Date    : June 2016
Author(s)           : A. Langley, W. Chang, N. Mavrogiannopoulos, J. Strombergson, S. Josefsson
Category            : PROPOSED STANDARD
Source              : Transport Layer Security
Stream              : IETF
Verifying Party     : IESG

[TLS] [Errata Held for Document Update] RFC7905 (… RFC Errata System