Return-Path: X-Original-To: tls@mail2.ietf.org Delivered-To: tls@mail2.ietf.org Received: from localhost (localhost [127.0.0.1]) by mail2.ietf.org (Postfix) with ESMTP id 89C4898EF1C for ; Mon, 10 Mar 2025 05:45:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at ietf.org X-Spam-Flag: NO X-Spam-Score: -4.398 X-Spam-Level: X-Spam-Status: No, score=-4.398 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: mail2.ietf.org (amavisd-new); dkim=pass (1024-bit key) header.d=dukhovni.org Received: from mail2.ietf.org ([166.84.6.31]) by localhost (mail2.ietf.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m5_OOO8Uy-zG for ; Mon, 10 Mar 2025 05:45:19 -0700 (PDT) Received: from chardros.imrryr.org (chardros.imrryr.org [144.6.86.210]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail2.ietf.org (Postfix) with ESMTPS id 17BB698EEEA for ; Mon, 10 Mar 2025 05:45:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dukhovni.org; i=@dukhovni.org; q=dns/txt; s=f8320d6e; t=1741610716; h=date : from : to : subject : message-id : reply-to : references : mime-version : content-type : in-reply-to : content-transfer-encoding : from; bh=fXci8AIlL47vfteHoK6uYTZX37FUw0nOQrn2cvjutSw=; b=ypbe0280gpG/45ubDGy5zG+u+yJ4jXpsIKZiBGAuG2tC68hQI3qOR0XVtLcuB9J12unxT FMisjYu3xJuYBqDvBE/yMcsvoK+e+QCvHFyKcribfz6QUB+GuaSoZHsXXYtMpgzRVGQ9EX5 i+i6rOjT2D2Q5sv+E0ls+hpxw735eAE= Received: by chardros.imrryr.org (Postfix, from userid 1000) id 5303193558C; Mon, 10 Mar 2025 23:45:16 +1100 (AEDT) Date: Mon, 10 Mar 2025 23:45:16 +1100 From: Viktor Dukhovni To: tls@ietf.org Message-ID: References: <20250309231710.335050.qmail@cr.yp.to> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Mail-Followup-To: Content-Transfer-Encoding: quoted-printable Message-ID-Hash: BO26JFLF3JJX2KWJF4RKZKOLNBFIDJ2K X-Message-ID-Hash: BO26JFLF3JJX2KWJF4RKZKOLNBFIDJ2K X-MailFrom: ietf-dane@dukhovni.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-tls.ietf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9rc6 Precedence: list Reply-To: tls@ietf.org Subject: =?utf-8?q?=5BTLS=5D_Re=3A_FW=3A_I-D_Action=3A_draft-kwiatkowski-tls-ecdhe-ml?= =?utf-8?q?kem-03=2Etxt?= List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Mon, Mar 10, 2025 at 10:54:16AM +0000, Peter C wrote: > In ML-KEM, Bob derives b deterministically from m and H(ek). > If Bob tried to reuse b with a different public key, then the > re-encryption check would fail during decapsulation.=20 Thanks for filling in my "momentary" lapse. Indeed the server is not free to choose a fixed "b" (=C5=B7). So server-side reuse is not possibl= e as originally claimed. --=20 Viktor.