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Re: [Suit] Suit manifest with variable recipients

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 21 July 2021 20:27 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: suit <suit@ietf.org>
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References: <F51C5D05-043E-4F07-9A4C-7044646192E3@arm.com> <27551.1626138598@localhost> <4B4235A6-3965-4FBD-AEA8-E16C900C4A0C@arm.com> <43747220-600F-44EE-98D5-B59C1AA3F63D@vigilsec.com> <338701d77d78$226ff8b0$674fea10$@reliableenergyanalytics.com> <D50BE7EB-02AF-4BC9-B0B9-8A1FBD804939@arm.com>
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Date: Wed, 21 Jul 2021 16:27:22 -0400
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Subject: Re: [Suit] Suit manifest with variable recipients
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Brendan Moran <Brendan.Moran@arm.com> wrote:
    > While I agree that this is a DoS issue, it’s possible to surgically DoS
    > individual devices without access to those devices or their
    > networks. As I laid out in my previous mail, this is a scalable DoS
    > that is difficult to detect: how does a Device Operator know why a
    > particular device does not have a COSE_Recipients? This is the
    > situation I want to avoid.

And, if it's visible to the Device Operator, then it's probably visible to
everyone.  So now you have a privacy issue.

If you leave out the device identities (the device has to try each cipher key
block until it finds one that decrypts for it: sorry I forget if have a
specific name for that), then there is more privacy, but no audit log.

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

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