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Re: [TLS] NULL cipher to become a MUST NOT in UTA BCP

Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Fri, 05 September 2014 14:18 UTC

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Date: Fri, 05 Sep 2014 17:18:21 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Manuel Pégourié-Gonnard <mpg@polarssl.org>
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References: <54048985.1020005@net.in.tum.de> <20140902152308.GB14392@mournblade.imrryr.org> <5409C149.1090402@polarssl.org>
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Subject: Re: [TLS] NULL cipher to become a MUST NOT in UTA BCP
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On Fri, Sep 05, 2014 at 03:57:29PM +0200, Manuel Pégourié-Gonnard wrote:
> 
> I realise encrypting local communications looks like a waste, but I'm curious if
> we can make this assertion more quantitative. With a typical workload, do you
> have any idea how much more CPU would be used by starting to encrypt these
> communications? (Eg with AES-GCM, both with and without hardware support.)

AES128-GCM with hardware support would use _less_ CPU (without it would use
more) than any current NULL ciphersuite (NULL_SHA1 is the fastest). 


-Ilari

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