Re: [idn] homograph attacks

[Martin Duerst]

At 06:40 05/02/17, Martin v. L$B�X(Bis wrote:
(B >JFC (Jefsey) Morfin wrote:
(B >> 1. When you register a IANA tag, you are to register it by language, 
(Bscript and ccTLD. This is clear.
(B >
(B >I don't see how this is relevant for this discussion. If the .com
(B >registrar decides to use a subset of 639 only, I consider this a valid
(B >choice. No need to register any language tag with IANA; all tags
(B >you ever want to use are already there.
(B
(BNot exactly correct. For cases like Serbian, Azerbaijani, Tajik,
(Bwhich can be written with different scripts, you need more than
(BISO 639. Serbian and Azerbaijani have script variant tags registered
(Bat IANA (see http://www.iana.org/assignments/language-tags); Tajik
(Bdoesn't (yet). There is a draft
(B(see http://www.ietf.org/internet-drafts/draft-phillips-langtags-10.txt)
(Bthat makes script codes generative, i.e. they don't have to be
(Bregistered anymore.
(B
(B >> 2. W3C discovered that a language tag by ISO 639 was not enough to 
(Bdescribe an XML document.
(B
(B[incorrect; extending ISO 639 with country codes was done by RFC 1766,
(Bwith the main input comming from email]
(B
(BRegards,    Martin.