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Re: [Curdle] call for adoption for draft-mu-curdle-ssh-xmss-00

Stephen Farrell <stephen.farrell@cs.tcd.ie> Fri, 29 November 2019 11:11 UTC

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To: "Hammell, Jonathan F" <Jonathan.Hammell@cyber.gc.ca>, "'curdle@ietf.org'" <curdle@ietf.org>
References: <20191128195955.D27F61208C7@ietfa.amsl.com>
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Fri, 29 Nov 2019 11:10:51 +0000
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Subject: Re: [Curdle] call for adoption for draft-mu-curdle-ssh-xmss-00
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On 28/11/2019 19:59, Hammell, Jonathan F wrote:
> Classification: UNCLASSIFIED
> 
> Hash-based signature schemes, such as XMSS, are appropriate for use
> cases where a limited number of signing operations will take place
> (due to the tree-based structure and high cost of signature
> generation) and those signatures will be validated far in the future
> (requiring the quantum-safe property).  Signing for SSH connections
> does not fit this model.  Furthermore, as others have pointed out,
> there are many concerns with managing the state of the private key in
> typical SSH scenarios.
> 
> I only see security concerns with using XMSS in SSH and no strong
> advantages.  Therefore, I am opposed to adoption.
> 

I think the above seems correct. I also hope that SSH
implementers don't adopt stateful signature schemes.

S

PS: Anyone know if ietf-ssh@netbsd.org still active or if
some other list has superseded that?

> Jonathan -- Canadian Centre for Cyber Security
> 
>> Daniel Migault <daniel.migault@ericsson.com> Wed, 20 November 2019
>> 14:38 UTCShow header
>> 
>> Hi,
>> 
>> This mail starts a call for adoption for
>> draft-mu-curdle-ssh-xmss-00 XMSS public key algorithms for the
>> Secure Shell (SSH) protocol. Please state on the mailing list
>> whether you support the adoption of the draft or if you have any
>> objection by December 5.
>> 
>> Yours, Rich and Daniel
>> 
>> [1] https://datatracker.ietf.org/doc/draft-mu-curdle-ssh-xmss/
> 
> 
> _______________________________________________ Curdle mailing list 
> Curdle@ietf.org https://www.ietf.org/mailman/listinfo/curdle
>

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