Hello. Here's a Telugu vs Kannada confusables list I cooked up right now. As this is an important security issue, I post to all the lists so that people may contribute. Also, some of this is probably already there but I'm going for completeness:
ANUSVARA VISARGA LETTER A LETTER AA LETTER I LETTER II LETTER VOCALIC L LETTER E LETTER EE LETTER AI LETTER O LETTER OO LETTER AU LETTER KHA LETTER GA LETTER GHA (?) LETTER NGA (?) LETTER JA LETTER JHA LETTER NYA LETTER TTA LETTER TTHA LETTER DDA LETTER DDHA LETTER NNA LETTER TA (?) LETTER THA LETTER DA LETTER DHA LETTER NA LETTER PA (?) LETTER PHA (?) LETTER BA LETTER BHA LETTER MA LETTER YA LETTER RA LETTER RRA LETTER LA LETTER LLA LETTER VA LETTER SHA LETTER SSA (?) LETTER SA (?) VOWEL SIGN AA VOWEL SIGN I VOWEL SIGN U VOWEL SIGN UU VOWEL SIGN VOCALIC R VOWEL SIGN VOCALIC RR VOWEL SIGN AU LETTER VOCALIC LL VOWEL SIGN VOCALIC L VOWEL SIGN VOCALIC LL (?) DIGIT ZERO DIGIT ONE DIGIT TWO DIGIT FOUR DIGIT FIVE (?) DIGIT SIX DIGIT EIGHT (?) DIGIT NINE That makes sixty two characters in all including the ones marked ?. Even *without* the ones marked ? (which I did because I suspected others may contest these cases) it comes to fifty two. Now to count the characters NOT common or confusable (obviously much lesser): LETTER U LETTER UU LETTER VOCALIC R LETTER KA LETTER CA LETTER CHA LETTER HA VOWEL SIGN II VOWEL SIGN E VOWEL SIGN EE VOWEL SIGN AI VOWEL SIGN O VOWEL SIGN OO LETTER VOCALIC RR DIGIT THREE DIGIT SEVEN That comes to sixteen. I left out the LLLA of Kannada and the fractions of Telugu which are *not* present (as of Unicode 6.0) in the other script because obviously there can be no comparison on those. So there are at least *thrice* (or at most *four times*) as many confusable characters between Kannada and Telugu than there are NON-confusables. Now can you beat that! Speaking of scripts with a common origin and causing potential confusion in IDNs, *I* say Kannada and Telugu takes the cake! Shriramana Sharma.
