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Re: [Cfrg] [Mathmesh] A different approach to key escrow

Michael Richardson <mcr+ietf@sandelman.ca> Tue, 03 September 2019 05:08 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Phillip Hallam-Baker <phill@hallambaker.com>
cc: mathmesh@ietf.org, cfrg@irtf.org
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Date: Tue, 03 Sep 2019 01:07:59 -0400
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Subject: Re: [Cfrg] [Mathmesh] A different approach to key escrow
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Phillip Hallam-Baker <phill@hallambaker.com> wrote:
    > This works with any public key algorithm but it requires a service.

...

    > * Generate a master secret of at least 128 bits
    > * Use a KDF to generate the master key pairs for Encryption and Signature
    > from the master secret
    > * Use Shamir secret sharing to split the master secret  n out of m ways

    > Thoughts?

I don't understand how the need for the service is different.

    > One side benefit of this approach is that it becomes quite easy to give
    > test vectors, just give the master secret used to generate the key
    > pairs.

please expand.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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