> From: ltru-bounces at lists.ietf.org [mailto:ltru-bounces at lists.ietf.org] On > Behalf Of Randy Presuhn > > Comment > > http://www.ietf.org/mail-archive/web/ltru/current/msg00540.html > > reads: > > "39. 4. An important security consideration is homographs. It is > > certainly possible to include part of text in a foreign language which > > look printed as in another language or having a different meaning or > > printing (phishing). Concerns are also the double "-" which is > > specifically used by the IANA code "xn"." > Perhaps this one might be accomodated by including an explicit statement > about how the repertoire for creating language tags makes homographs a > non-issue (at least in a well-designed font) for the tags themselves. Because the character repertoire permitted in our protocol elements is limited to a-z, A-Z, 0-9 and "-" (with no two consecutive "-"s allowed), I believe the only homograph issue is between LATIN SMALL LETTER L and DIGIT ONE. Since the ISO source standards we use all use alpha-only IDs, and the M.49 numeric IDs are numeric only, the only potential for confusion exists in registered variants. We might consider imposing a requirement on subtag registrations that no subtag may be registered if it differs from an existing subtag only by substitution of confusables (l and 1). If we want to do that, we might also want to make this a requirement on extension RFCs. Peter Constable _______________________________________________ Ltru mailing list Ltru at lists.ietf.org https://www1.ietf.org/mailman/listinfo/ltru
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