A homograph attack is based on standards of modern Internet that allow to create (and display in web browsers) URLs with characters from various language sets (with non-ASCII letters). Different languages may contain different but very similar characters. Attackers can register their own domain names that are similar to the existing web addresses. Then they can create their own websites that are, again, the same or very similar to the existing original sites (that usually belong to banks, corporations, email or news services). The phony websites are used for stealing data from users who happened to visit them.
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