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Re: [lamps] [EXTERNAL] Re: LAMPS Re-charter

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 25 March 2021 14:49 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
cc: Mike Ounsworth <Mike.Ounsworth=40entrust.com@dmarc.ietf.org>, Russ Housley <housley@vigilsec.com>, Rene Struik <rstruik.ext@gmail.com>, LAMPS <spasm@ietf.org>
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Date: Thu, 25 Mar 2021 10:49:40 -0400
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Subject: Re: [lamps] [EXTERNAL] Re: LAMPS Re-charter
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Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:
    >> Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:
    >> > PQ-hybrid signatures are a much easier thing to tackle than PQ-hybrid
    >> > encryption.  But PQ-hybrid encryption is also the thing that has the
    >> > most urgency.  Signature verification has an out: verifiers can
    >> > time-bound their acceptance of legacy signatures once a quantum-based
    >> > cryptanalytic attack becomes known to be plausible.
    >>
    >> Do you mean that a verifier can say, "I'll accept your legacy signature as
    >> long as it's less than 2hr old"
    >> ("2hr" being the time I think it takes for a PQ to be mounted).

    > The time-bound i was thinking of was:

    > - If a quantum-based cryptanalytic attack becomes feasible on a given
    > algorithm at time T, then a verifier can still re-validate any
    > signatures that arrived (that is, that the verifier has had a copy
    > of, or that is visible in some robust historic ledger) prior to time
    > T.  That is, old, pre-existing signatures are not automatically
    > invalidated by a new quantum attack.  Note that this is *not* the
    > case for encrypted material -- old, pre-existing encryption
    > protection can indeed be invalidated by a new quantum attack.

Thank you for the clarification.
I wasn't proposing something different, just trying to understand.

You are right that a the PQ attack would likely be used to recover private
keys, not just forge signatures.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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