Re: [Cfrg] Message Digest Algorithm Choice for CMS with Ed448
Taylor R Campbell <campbell+cfrg@mumble.net> Mon, 14 November 2016 18:53 UTC
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From: Taylor R Campbell <campbell+cfrg@mumble.net>
To: "Salz, Rich" <rsalz@akamai.com>
In-reply-to: <1dddb08d223647379152df9213b08a02@usma1ex-dag1mb1.msg.corp.akamai.com> (rsalz@akamai.com)
Date: Mon, 14 Nov 2016 18:53:47 +0000
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Cc: IRTF CFRG <cfrg@irtf.org>, Russ Housley <housley@vigilsec.com>
Subject: Re: [Cfrg] Message Digest Algorithm Choice for CMS with Ed448
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Date: Mon, 14 Nov 2016 18:30:38 +0000 From: "Salz, Rich" <rsalz@akamai.com> > It seems that SHA3-512 would be a good choice to avoid having to implement > more that one message digest algorithm to generate the signature or > validate it. Let's rephrase: Any argument *against* SHA3-512? (yes, jetlag stinks:) SHA3-512 is slow in order to attain the meaninglessly high 512-bit preimage resistance, whereas SHAKE256-512 provides `only' 256-bit preimage resistance at much higher speed. Both provide only 256-bit collision resistance. Note that draft-irtf-cfrg-eddsa doesn't use SHA3-512 at all, whereas it does use SHAKE256 for several purposes.
- [Cfrg] Message Digest Algorithm Choice for CMS wi… Russ Housley
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Scott Fluhrer (sfluhrer)
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Ilari Liusvaara
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Derek Atkins
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Salz, Rich
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Taylor R Campbell
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Taylor R Campbell
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Jim Schaad
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Salz, Rich
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Taylor R Campbell
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Taylor R Campbell
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Russ Housley
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Ilari Liusvaara
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Derek Atkins
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Watson Ladd
- [Cfrg] Re: Message Digest Algorithm Choice for CM… Russ Housley
- Re: [Cfrg] Message Digest Algorithm Choice for CM… Ilari Liusvaara