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AES128 or AES256 by default?

From: Simon Josefsson
Subject: AES128 or AES256 by default?
Date: Thu, 15 May 2008 11:34:50 +0200
User-agent: Gnus/5.110009 (No Gnus v0.9) Emacs/22.2 (gnu/linux)

There is a debian bug:

Which asks that we make AES-256 the default preferred cipher.  Right now
AES-128 is the default preferred cipher.  Of course, today AES-256 is
supported as well (it is the second preferred default cipher).

What do people think here?

I don't care strongly, but I find the arguments for AES-256 rather weak.
According to RFC 3766, to match a 256 bit symmetric key size, you need a
~15kb large RSA key or a ~500b large DSA key.  People don't use that
kind of public key sizes today as far as I know, as they become very
big.  The few who do should be able to tweak the GnuTLS cipher
preference accordingly.


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