Re: [saag] Improving the CHAP protocol
Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com> Wed, 18 September 2019 16:23 UTC
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References: <9641f69d-0ffb-1c1d-7fb6-98ef4a54ad2c@redhat.com> <19010.1568821685@contrail-ubm16-mdb.svec1.juniper.net>
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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Wed, 18 Sep 2019 12:22:29 -0400
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To: "Mark D. Baushke" <mdb=40juniper.net@dmarc.ietf.org>
Cc: Maurizio Lombardi <mlombard@redhat.com>, saag@ietf.org
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Subject: Re: [saag] Improving the CHAP protocol
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Maurizio, This is the right place to start the discussion. If you pull together a draft before the deadline and want a slot to present at SecDispatch, send a message there as well. SecDispatch will help find a home for the draft, even if that is an AD sponsored draft (if there's not WG that is a fit). Best regards, Kathleen On Wed, Sep 18, 2019 at 11:48 AM Mark D. Baushke <mdb= 40juniper.net@dmarc.ietf.org> wrote: > Hi Maurizio, > > Summary: SHA2-512/256 looks good to me. You may also wish to consider > SHAKE128(M,256) or SHAKE256(M,256) generating 256 bits. > > Long reply: > > See "Comparing Hardware Performance of Round 3 SHA-3 Candidates using > Multiple Hardware Architectures in Xilinx and Altera FPGAs" > > https://pdfs.semanticscholar.org/20e2/3a26384b0edc4a218d2d180f0658c1c9a05f.pdf > and look for Keecak vs SHA-2 results. > > Doing SHA3 in hardware is going to be faster than doing SHA2 in > hardware. > > Doing SHA3 in software is going to be much slower than doing SHA2 in > software. > > Comparing SHA2-256 to SHA2-512/256 in software depends on the native > size of a CPU word. > > On a 64bit CPU, I beleve that doing a SHA2-256 will be slower than > doing a SHA2-512/256 on the order of 30% (best to run your own > benchmarks using something like 'openssl speed'). > > Per FIPS Publication 202, for SHA3, to get 256-bits of hash, there are > alternatives: SHA3-256, and the two Extendable-Output Functions (XOF): > SHAKE128 and SHAKE256. (There is no definition for SHA3-512/256.) > > I have not done any software performance analysis of SHA3 functionality, > however, the https://keccak.team/2017/is_sha3_slow.html shows that using > the XOF functions are on performance part with SHA-2 on common > processors. > > Considering longer term safety of the 256-bit hashes... > > The SHA2-512/256 keeps an internal state of 1024 bits and displays only > 256 bits of the finished hash. While SHA2-256 keeps an internal state of > 512 bits and displays half of it (256 bits), so from a data hiding point > of view is should be more secure to use SH2-512/256. > > As the intention is cryptographic agility, I think that adding > SHA2-512/256 is a good idea. > > It may also be desirable to consult with your FIPS experts to determine > if SHAKE{128,256} is acceptable to generate the 256-bits needed and be > FIPS 140-2 compliant. > > -- Mark > > _______________________________________________ > saag mailing list > saag@ietf.org > https://www.ietf.org/mailman/listinfo/saag > -- Best regards, Kathleen
- [saag] Improving the CHAP protocol Maurizio Lombardi
- Re: [saag] Improving the CHAP protocol Mark D. Baushke
- Re: [saag] Improving the CHAP protocol Kathleen Moriarty
- Re: [saag] Improving the CHAP protocol Black, David
- Re: [saag] Improving the CHAP protocol Kathleen Moriarty
- Re: [saag] Improving the CHAP protocol Peter Gutmann
- Re: [saag] Improving the CHAP protocol Yoav Nir
- Re: [saag] Improving the CHAP protocol Peter Gutmann
- Re: [saag] Improving the CHAP protocol Alan DeKok
- Re: [saag] Improving the CHAP protocol John Mattsson
- Re: [saag] Improving the CHAP protocol Peter Gutmann
- Re: [saag] Improving the CHAP protocol Maurizio Lombardi
- Re: [saag] Improving the CHAP protocol Black, David
- Re: [saag] Improving the CHAP protocol Alan DeKok
- Re: [saag] Improving the CHAP protocol Peter Gutmann
- Re: [saag] Improving the CHAP protocol Black, David
- Re: [saag] Improving the CHAP protocol Salz, Rich
- Re: [saag] Improving the CHAP protocol Jim Schaad
- Re: [saag] Improving the CHAP protocol Black, David
- Re: [saag] Improving the CHAP protocol Mark D. Baushke
- Re: [saag] Improving the CHAP protocol John Mattsson
- Re: [saag] Improving the CHAP protocol Dang, Quynh (Fed)