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Re: [MSEC] Review comments, was RE: GDOI support for IEC 62351

Brian Weis <bew@cisco.com> Mon, 21 October 2013 18:10 UTC

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From: Brian Weis <bew@cisco.com>
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Date: Mon, 21 Oct 2013 11:09:34 -0700
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To: Paul Lambert <paul@marvell.com>
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Cc: "msec@ietf.org" <msec@ietf.org>, Sean Turner <turners@ieca.com>, "draft-weis-gdoi-iec62351-9@tools.ietf.org" <draft-weis-gdoi-iec62351-9@tools.ietf.org>
Subject: Re: [MSEC] Review comments, was RE: GDOI support for IEC 62351
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Hi Paul,

On Oct 18, 2013, at 6:14 PM, Paul Lambert <paul@marvell.com> wrote:

> 
>> 
>> We decided to drop support for AES-GCM here because there doesn't seem to
>> be a safe way to use AES-GCM in the GOOSE and SV security transforms.
>> AES-GCM takes a counter as input, but there is no explicit counter
>> defined in the IEC documents by which the receiver would know what
>> counter to use for decryption (or for integrity protection if AES-GMAC is
>> used).
> So what's used instead?

The draft specifies AES-CBC for confidentiality, and HMAC-SHA256 for integrity.

Brian

> 
> Paul
> 

-- 
Brian Weis
Security, Enterprise Networking Group, Cisco Systems
Telephone: +1 408 526 4796
Email: bew@cisco.com

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