Re: [idn] homograph attacks

["Martin v. Löwis" <martin@v.loewis.de>]

Kane, Pat wrote:
> VeriSign does prevent domains with the Russian language tag from commingling
> A-Z with the Cyrillic characters.  It does permit 0-9 and the dash to be
> used.  This filter also applies to other Cyrillic based languages such as
> Belarusian, Ukrainian, Serbian, Macedonian and Bulgarian.  
>
> There are other languages that are listed within ISO 639-2 that today use a
> combination of Latin and Cyrillic as they were originally Latin based (Tajik
> was Arabic prior to being Latin based), migrated to Cyrillic during the
> Soviet era and today are migrating back to Latin.

Thanks for the clarification. Is this information publically available
somehow? On

http://www.verisign.com/static/002533.pdf

I can find the language code list (which shows that indeed TGK and RUS
might be treated differently); I wonder whether you somehow list the
constraints implemented for each tag. How did the applicant know that
he would have to use Tajik in order to get a cyrillic letter into an
otherwise latin label?

As for the Tajik writing system: why is it then necessary to allow
mixed scripts? Wouldn't the Tajik users be satisfied if you could
either register all-Latin or all-Cyrillic labels (perhaps allowing
all-Arabic as well)?

Regards,
Martin