Re: [TLS] Data volume limits

Watson Ladd <watsonbladd@gmail.com> Tue, 15 December 2015 22:28 UTC

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Date: Tue, 15 Dec 2015 17:28:04 -0500
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From: Watson Ladd <watsonbladd@gmail.com>
To: Russ Housley <housley@vigilsec.com>
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Subject: Re: [TLS] Data volume limits
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On Tue, Dec 15, 2015 at 5:18 PM, Russ Housley <housley@vigilsec.com> wrote:
>
> On Dec 15, 2015, at 4:14 PM, Eric Rescorla wrote:
>
>> Watson kindly prepared some text that described the limits on what's safe
>> for AES-GCM and restricting all algorithms with TLS 1.3 to that lower
>> limit (2^{36} bytes), even though ChaCha doesn't have the same
>> restriction.
>>
>> I wanted to get people's opinions on whether that's actually what we want
>> or whether we should (as is my instinct) allow people to use ChaCha
>> for longer periods.
>
> Perhaps the algorithm registration can provide the limit, allowing implementations use the full period for each algorithm.

That makes sense, but people might ignore these values in the
registry, and the entries might not be reviewed as well as they should
be compared to if they are in the relevant RFCs.
>
> Russ
>
>
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