Re: [quicwg/base-drafts] Expand AEAD limits to consider multi-user security. (#3789)
Martin Thomson <notifications@github.com> Fri, 26 June 2020 02:17 UTC
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Date: Thu, 25 Jun 2020 19:17:18 -0700
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Expand AEAD limits to consider multi-user security. (#3789)
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@martinthomson commented on this pull request. > @@ -2207,10 +2206,14 @@ v: bound on the number of forged packets that an endpoint can reject before updating keys. -The analysis of AEAD_AES_128_CCM relies on a count of the number of block -operations involved in producing each message. For simplicity, and to match the -analysis of other AEAD functions in {{AEBounds}}, this analysis assumes a -packet length of 2^10 blocks and a packet size limit of 2^14. +o: + +: The amount of offline ideal cipher queries made by an adversary. + +The analyses that follow rely on a count of the number of block operations +involved in producing each message. For simplicity, and to match the analysis of +other AEAD functions in {{AEBounds}}, this analysis assumes a packet length of +2^10 blocks; that is, a packet size limit of 2^14 bytes. Line 1588 (on the new side). David raised an issue requesting that we provide limits based on an assumption of 2^16 byte packets. If we do that, we might want to do a split between 2^11 and 2^16 rather than having 2^14. We should track that on that issue though. > + +~~~ +(q + v) <= 2^28 +~~~ + +Assuming `v = q`, endpoints cannot protect more than 2^27 packets in a single +connection without causing an attacker to gain an larger advantage than the +target of 2^-60. + +### Integrity Limit + +For integrity, Theorem (4.3) in {{?GCM-MU}} establishes that an attacker gains +an advantage in successfully forging a packet of no more than: + +~~~ +(1 / 2^(8 * n)) + ((2 * v) / 2^2*n) + ((2 * o * v) / 2^(k + n)) OK, that's safe (just). -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/quicwg/base-drafts/pull/3789#discussion_r445933209
- [quicwg/base-drafts] Expand AEAD limits to consid… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Jana Iyengar
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Jana Iyengar
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Jana Iyengar
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… martinduke
- Re: [quicwg/base-drafts] Expand AEAD limits to co… martinduke
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christian Huitema
- Re: [quicwg/base-drafts] Expand AEAD limits to co… David Schinazi
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Jana Iyengar
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Christopher Wood
- Re: [quicwg/base-drafts] Expand AEAD limits to co… ekr
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Jana Iyengar
- Re: [quicwg/base-drafts] Expand AEAD limits to co… David Schinazi
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson
- Re: [quicwg/base-drafts] Expand AEAD limits to co… Martin Thomson