the unicode consortium addresses this: http://unicode.org/reports/tr39/#Confusable_Detection http://unicode.org/reports/tr39/#Confusable_Detection edit: a quic

the unicode consortium addresses this: http://unicode.org/reports/tr39/#Confusable_Detection http://unicode.org/reports/tr39/#Confusable_Detection edit: a quick search found implementations of the described algorithms in c++ (ICU library) and perl (Unicode::Security).