From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from arnowagner.info (mail.tansi.org [84.19.178.47]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 15A5F3F6C2D for ; Mon, 29 Jun 2026 18:46:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=84.19.178.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782758767; cv=none; b=iqavzL5ubvEAl8nt5HAEqltyLkLGAuiJY5ohRrAdissYXRerEJ8/1xwedX98KP/ERNRRWLdMEE05W4x08xZV6nf7qvkM7ccuLRahBpKv8pZjf1btlFotX2uiLr4MgfY3L/2crLhZcypwWmRCKuvXU5A+MW27XPU4ATuXs64t4Rs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782758767; c=relaxed/simple; bh=dB3IIueXNVSARJc4MD6iZsWvHMDewJsqP+5eR+SRb2E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=F/QK9UgRvU1tbrzh9Ox1PSH98ywq3oDvCafs8I887AeF9MHNeObOSH9AhawUqJrrapcW6Fz6RUNjaZWMv6b8lfBm5OGNvvN7BiSrzQ95+P8cyqfb1gxuaYWAZQsrDI1iIFvENbjr/8OoV9ETKz1V71tT1qeREhln5+uzrkfGtcE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=arnowagner.info; spf=pass smtp.mailfrom=arnowagner.info; arc=none smtp.client-ip=84.19.178.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=arnowagner.info Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arnowagner.info Received: from gate.tansi.org (81-6-44-245.init7.net [81.6.44.245]) by v1.tansi.org (Postfix) with ESMTPA id 3C605140057; Mon, 29 Jun 2026 20:38:42 +0200 (CEST) Received: by gate.tansi.org (Postfix, from userid 1000) id 1288117AD26; Mon, 29 Jun 2026 20:40:42 +0200 (CEST) Date: Mon, 29 Jun 2026 20:40:42 +0200 From: Arno Wagner To: Milan Broz Cc: cyper@tutanota.com, Cryptsetup Subject: Re: [feature] PQC KEM Message-ID: Reply-To: Arno Wagner References: Precedence: bulk X-Mailing-List: cryptsetup@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Jun 29, 2026 at 18:42:03 CEST, Milan Broz wrote: > On 6/29/26 6:27 PM, cyper@tutanota.com wrote: > > Interested in introducing a new LUKS2 "xwing" keyslot type unlocked by an X-Wing > > post-quantum hybrid KEM (ML-KEM-768 + X25519, draft-connolly-cfrg-xwing-kem) > > instead of a passphrase to encrypt the kek (volume key)? > > > > 1) asymmetric model won't shine in single user case but will be attractive in multiple user/image enrollment cases. > > 2) if per-device fresh wrapping key is desired > > > > > > I've implemented such keyslot type and tested.  But don't know if the aforementioned two cases is worth discussion. > > This is typically something that should be done through LUKS2 external token while keeping keyslot > encryption as it is defined in LUKS. (Maybe you did it that way, no idea.) > > Anyway, what security issue this solves (except "it is PQC")? That seems to be the key question. Also refer to https://www.cs.auckland.ac.nz/~pgut001/pubs/bollocks.pdf Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@wagner.name GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier