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

Paul Lambert <paul@marvell.com> Tue, 22 October 2013 03:55 UTC

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From: Paul Lambert <paul@marvell.com>
To: Brian Weis <bew@cisco.com>
Date: Mon, 21 Oct 2013 20:55:44 -0700
Thread-Topic: [MSEC] Review comments, was RE: GDOI support for IEC 62351
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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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On 10/21/13 11:09 AM, "Brian Weis" <bew@cisco.com>; wrote:

>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.

Thanks.


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