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Re: [dmarc-ietf] cousin domain definition (was Re: Fwd: Eliot's review of the DMARC spec)

"Murray S. Kucherawy" <superuser@gmail.com> Sun, 07 July 2013 06:04 UTC

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References: <519B47DC.20008@cisco.com> <CAL0qLwYZOp1FNVSAmzXYkZG_O3Yv+EQrAKKLpRiE5svcOMamTA@mail.gmail.com> <6.2.5.6.2.20130523002139.0da7ac58@resistor.net> <CAL0qLwYT6BS=HGLX1-u80aqaJWefipT5tcg5Ut_549y4rOej9g@mail.gmail.com> <51D858EB.3030202@gmail.com>
Date: Sat, 06 Jul 2013 23:04:12 -0700
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From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Dave Crocker <dcrocker@gmail.com>
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Cc: SM <sm@resistor.net>, "dmarc@ietf.org" <dmarc@ietf.org>, Eliot Lear <lear@cisco.com>
Subject: Re: [dmarc-ietf] cousin domain definition (was Re: Fwd: Eliot's review of the DMARC spec)
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On Sat, Jul 6, 2013 at 10:50 AM, Dave Crocker <dcrocker@gmail.com> wrote:

> So in looking these over, I find myself liking the phrase "deceptively
> similar".  Hence I'll propose:
>
>      A cousin domain is a registered domain name that is deceptively
> similar to a target domain name.  The target domain is familiar to many
> end-users, and therefore imparts a degree of trust.  The deceptive
> similarity can trick the user by embedding the essential parts of the
> target name, in a new string, or it can use some variant of the target
> name, such as replacing 'i' with '1'.
>
>
Seems a reasonable starting point.  Might also include a reference to
"homograph (literally, one appearance) attack".

-MSK

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