Re: [Cfrg] Fwd: New Version Notification for draft-krawczyk-cfrg-opaque-06.txt
clinton bowen <clinton.bowen@gmail.com> Mon, 06 July 2020 22:30 UTC
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From: clinton bowen <clinton.bowen@gmail.com>
Date: Mon, 06 Jul 2020 15:30:16 -0700
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To: Hugo Krawczyk <hugokraw@gmail.com>
Cc: "<cfrg@ietf.org>" <cfrg@ietf.org>
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Subject: Re: [Cfrg] Fwd: New Version Notification for draft-krawczyk-cfrg-opaque-06.txt
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Hello, A small note regarding https://www.ietf.org/internet-drafts/draft-krawczyk-cfrg-opaque-06.txt, could we revise the following formula in section 4 from: KEYS = HKDF-Expand(key=RwdU, info=(nonce | "EnvU"), Length=LS+LH+LH) to: KEYS = HKDF-Expand(key=RwdU, info=(Nonce | "EnvU"), Length=LS+LH+LH) -Clinton On Fri, Jun 19, 2020 at 9:26 PM Hugo Krawczyk <hugokraw@gmail.com> wrote: > A new version of draft-krawczyk-cfrg-opaque is available. > It has an important change in the way secret information under the > envelope EnvU is protected. > > There is no form of optional encryption or use of counter mode anymore. > Instead it defines a very specific mechanism: > Secret information included in EnvU is xor-ed with a pseudo random > pad derived from RwdU, and HMAC is computed on the concatenation of this > value > and any non-secret information included in EnvU. This simple mechanism > satisfies the encryption requirement of OPAQUE and obviates any need to > specify > other RKR-secure schemes. In particular, it eliminates the "temptation" to > use > non-RKR modes such as GCM. Performance considerations are insignificant > here as > EnvU requires encryption of very short plaintexts. Applications that > require > sending additional information (e.g., non-OPAQUE user secrets stored at the > server) will use ExportKey (previously called KdKey) with any encryption > scheme of their choice. No RKR requirement in this case. > See Section 4 for the details. > > This version also corrects a typo in the specification of SIGMA (the > identities > in messages K2 and K3 got mixed up in the version 05 of the draft). > > Very important: This draft is still intended as a high level description > of the > protocol and its components. A detailed specification is underway and will > be > posted shortly as draft-irtf-cfrg-opaque. OPAQUE implementers should follow > the specifications in that document. > > Hugo > > ---------- Forwarded message --------- > From: <internet-drafts@ietf.org> > Date: Sat, Jun 20, 2020 at 12:20 AM > Subject: New Version Notification for draft-krawczyk-cfrg-opaque-06.txt > To: Hugo Krawczyk <hugokraw@gmail.com> > > > > A new version of I-D, draft-krawczyk-cfrg-opaque-06.txt > has been successfully submitted by Hugo Krawczyk and posted to the > IETF repository. > > Name: draft-krawczyk-cfrg-opaque > Revision: 06 > Title: The OPAQUE Asymmetric PAKE Protocol > Document date: 2020-06-19 > Group: Individual Submission > Pages: 26 > URL: > https://www.ietf.org/internet-drafts/draft-krawczyk-cfrg-opaque-06.txt > Status: > https://datatracker.ietf.org/doc/draft-krawczyk-cfrg-opaque/ > Htmlized: https://tools.ietf.org/html/draft-krawczyk-cfrg-opaque-06 > Htmlized: > https://datatracker.ietf.org/doc/html/draft-krawczyk-cfrg-opaque > Diff: > https://www.ietf.org/rfcdiff?url2=draft-krawczyk-cfrg-opaque-06 > > Abstract: > This draft describes the OPAQUE protocol, a secure asymmetric > password authenticated key exchange (aPAKE) that supports mutual > authentication in a client-server setting without reliance on PKI and > with security against pre-computation attacks upon server compromise. > Prior aPAKE protocols did not use salt and if they did, the salt was > transmitted in the clear from server to user allowing for the > building of targeted pre-computed dictionaries. OPAQUE security has > been proven by Jarecki et al. (Eurocrypt 2018) in a strong and > universally composable formal model of aPAKE security. In addition, > the protocol provides forward secrecy and the ability to hide the > password from the server even during password registration. > > Strong security, versatility through modularity, good performance, > and an array of additional features make OPAQUE a natural candidate > for practical use and for adoption as a standard. To this end, this > draft presents several instantiations of OPAQUE and ways of > integrating OPAQUE with TLS. > > This draft presents a high-level description of OPAQUE, highlighting > its components and modular design. It also provides the basis for a > specification for standardization but a detailed specification ready > for implementation is beyond the scope of this document. > > Implementers of OPAQUE should ONLY follow the precise specification > in the upcoming draft-irtf-cfrg-opaque. > > > > > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > > _______________________________________________ > Cfrg mailing list > Cfrg@irtf.org > https://www.irtf.org/mailman/listinfo/cfrg > -- -Clinton M. Bowen
- [Cfrg] Fwd: New Version Notification for draft-kr… Hugo Krawczyk
- Re: [Cfrg] Fwd: New Version Notification for draf… clinton bowen
- Re: [Cfrg] Fwd: New Version Notification for draf… Hugo Krawczyk