Re: The TCP and UDP checksum algorithm may soon need updating

Joseph Touch <touch@strayalpha.com> Sun, 07 June 2020 22:20 UTC

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Subject: Re: The TCP and UDP checksum algorithm may soon need updating
From: Joseph Touch <touch@strayalpha.com>
In-Reply-To: <830b91c4-0bb5-af5b-f7b8-c5edd43dc87e@mtcc.com>
Date: Sun, 07 Jun 2020 15:20:43 -0700
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References: <28A2725D-00F8-4739-8A73-ED176F8EF561@strayalpha.com> <3AA98081-A70E-4076-8096-79FFAEE8A738@huitema.net> <830b91c4-0bb5-af5b-f7b8-c5edd43dc87e@mtcc.com>
To: Michael Thomas <mike@mtcc.com>
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TLS isn’t “transport layer”. It’s app-layer.

TCP-AO is transport layer - and would similarly protect against middlebox modifications.

Joe

> On Jun 7, 2020, at 2:16 PM, Michael Thomas <mike@mtcc.com> wrote:
> 
> 
> On 6/7/20 12:39 PM, Christian Huitema wrote:
>>> On Jun 7, 2020, at 12:08 PM, Joseph Touch <touch@strayalpha.com> wrote:
>>> 
>>> Overall, I’d feel a lot better about upending transport checksums if we had evidence that the checksum wasn’t catching errors. If the checksum is correct because it’s being constantly recomputed without being checked, a new alg won’t fix the issue.
>> Or, use a keyed cryptographic checksum and do not give the key to middleboxes.
>> 
> I've always had an unease about transport layer security vs transport IPsec. At least I now have something to hang my hat on.
> 
> Mike
> 
>