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

Paul Lambert <paul@marvell.com> Sat, 19 October 2013 01:14 UTC

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From: Paul Lambert <paul@marvell.com>
To: Brian Weis <bew@cisco.com>, "Fries, Steffen" <steffen.fries@siemens.com>
Date: Fri, 18 Oct 2013 18:14:29 -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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>
>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?

Paul