Re: [TLS] Data volume limits

Aaron Zauner <azet@azet.org> Fri, 01 January 2016 07:04 UTC

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Date: Fri, 1 Jan 2016 08:04:11 +0100
From: Aaron Zauner <azet@azet.org>
To: Simon Josefsson <simon@josefsson.org>
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Subject: Re: [TLS] Data volume limits
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* Aaron Zauner <azet@azet.org> [01/01/2016 07:35:26] wrote:
> This might be a good time to point again to my existing AES-OCB
> draft that hasn't really seen a lot of discussion nor love lately.
> It expired but I've recently updated the draft (not yet uploaded
> to IETF as I'm waiting for implementer feedback from two particular
> sources). The update has something to do with how GCM is implemented
> in some stacks though, see:
> https://github.com/azet/draft-zauner-tls-aes-ocb/commit/26c2fff7808fc88bf47e5d097f2ff5ca23201029

Having said that, it's probably also a good idea for me to mention
that the OCB designers point out that:
```
[...]

Birthday-bound attacks (as well as good cryptographic hygine)
motivate rekeying well in advance of birthday-bound concerns. In RFC
7253 we say that a given a key should be used to encrypt at most 248
blocks (about 280 terabytes).
``` -- http://web.cs.ucdavis.edu/~rogaway/ocb/ocb-faq.htm#ferguson

Aaron