[CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13
Hugo Krawczyk <hugo@ee.technion.ac.il> Fri, 10 May 2024 15:28 UTC
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References: <CAMr0u6kOrbwdHEDmmGsVYzqjsEbzBCCtGL39jckNbSWsEumOQg@mail.gmail.com> <994001115.165708.1706765982169@email.ionos.com> <CACitvs8zzoQVY4uo1zOtoBWrSVOLfzGFBCsMnevxnCMXg-CJGw@mail.gmail.com> <CACitvs_kEOgBC0eZNbHZ1EBy6v7kqL2-99-A1kRD_QqTaTuQKw@mail.gmail.com> <CAMr0u6khy2oo6GpxYYWq803NPYvKHLk4=9Lf7Z5ddNVu8KbiZw@mail.gmail.com> <CACitvs-_iZ145ok1A8peN642Z2DmA=Pd1T2cJwrFnQo_PZxWqw@mail.gmail.com> <4277693.8349904.1713368966703@email.ionos.com> <CADi0yUPxQsktpso7htB5+6M+ZJRyhax+QiUBNJQa3RG5GwLfCw@mail.gmail.com> <1916772043.8833957.1713572703792@email.ionos.com> <CADi0yUPJP+PrLYxw1iCay3VFLYDqktja_51QLdW3YiKC9RW=Uw@mail.gmail.com> <CAMr0u6kypySZrDx5zMz9Y7S4U5-Z16vYSuwKvkOV89tgAh4C=w@mail.gmail.com> <GV1PR01MB8436DA9FC923665CE88FF637D61B2@GV1PR01MB8436.eurprd01.prod.exchangelabs.com> <CADi0yUOoKRFxO85cYygX7V3jxL6kZE8hkW6S91eLa2fr_pgQ4g@mail.gmail.com> <GV1PR01MB8436A8B3E01489A85372BAAAD6192@GV1PR01MB8436.eurprd01.prod.exchangelabs.com> <CADi0yUP9RuR9c_jC-hDezOKz4TqqRurCPqFd18yBriZEVs1gEw@mail.gmail.com> <GV1PR01MB8436B1FCDC974F04182A5FF3D6E72@GV1PR01MB8436.eurprd01.prod.exchangelabs.com>
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From: Hugo Krawczyk <hugo@ee.technion.ac.il>
Date: Fri, 10 May 2024 11:27:35 -0400
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To: "Hao, Feng" <Feng.Hao@warwick.ac.uk>
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Subject: [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13
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Defense against enumeration attacks is obtained via two mechanisms: derivation of OPRF keys from a PRF and post-encryption of OPAQUE message with the masking key. These two do not affect the analysis of OPAQUE as an augmented PAKE. Derivation via PRF is consistent with OPAQUE analysis that assumes OPRF keys to be random or pseudorandom. The additional post-encryption of the OPAQUE messages under the masking key, pseudorandomly derived from randomized_password, is simply simulated with a random independent masking key (as noted in the current draft). On Fri, May 10, 2024 at 10:33 AM Hao, Feng <Feng.Hao@warwick.ac.uk> wrote: > > > - Feng, we believe that the current draft explains the protection > against enumeration attacks in sufficient detail (including its two main > elements: deriving the OPRF key from a PRF and the use of the masking key). > > > > OK. It seems clear that the protocol as specified in the 2018 paper has > been modified. There was no masking key in the original spec. This looks > like a non-trivial change, and the implications are not immediately clear. > I don’t know to what extent this modification has been publicly > peer-reviewed. > > > > Modifying a protocol can be extremely delicate. Some people may remember > that the SRP-3 protocol defined in Wu’s 1998 paper was selected by IEEE > P1363.2 in 2000, but was modified in 2002 to address a subtle > two-for-one-guess attack. It took people another 7 years to realize that > the modified protocol was still unable to prevent the attack, and the > protocol had to be modified again in 2009 to a new version SRP-6a. Part of > the problem is that modifications made to the original 1998 protocol were > never fully explained in any peer-reviewed document. >
- [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Russ Housley
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 steve
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Stefan Santesson
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Riad S. Wahby
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 stef
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Riad S. Wahby
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 stefan marsiske
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Riad S. Wahby
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Campagna, Matthew
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 steve
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 steve
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- Re: [CFRG] RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Watson Ladd
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Eric Rescorla
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Eric Rescorla
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hugo Krawczyk
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Eric Rescorla
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Hao, Feng
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Watson Ladd
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Christopher Patton
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Christopher Patton
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Kevin Lewi
- [CFRG] Re: RGLC on draft-irtf-cfrg-opaque-13 Stanislav V. Smyshlyaev