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Date: Wed, 20 Sep 2017 15:45:07 +0200
From: Stephan Mueller <>
To: "Jason A. Donenfeld" <>
Cc:,,, LKML <>, David Howells <>, Eric Biggers <>, Herbert Xu <>, Kirill Marinushkin <>,,
Subject: Re: [PATCH v6] security/keys: rewrite all of big_key crypto

Am Mittwoch, 20. September 2017, 12:52:21 CEST schrieb Jason A. Donenfeld:

Hi Jason,

> This sounds incorrect to me.  Choosing a fresh, random, one-time-use
> 256-bit key and rolling with a zero nonce is a totally legitimate way
> of using GCM. There's no possible reuse of the key stream this way.
> However, on the off chance that you know what you're talking about,
> could you outline the cryptographic attack you have in mind, or if
> that's too difficult, simply link to the relevant paper on eprint?


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