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A further problem with URLs has been found in the handling of internationalized domain names (IDN) in web browsers, that might allow visually identical web addresses to lead to different, possibly malicious, websites.Despite the publicity surrounding the flaw, known as IDN spoofing Even digital certificates do not solve this problem because it is quite possible for a phisher to purchase a valid certificate and subsequently change content to spoof a genuine website, or, to host the phish site without SSL at all.Several phishing attacks have been directed specifically at senior executives and other high-profile targets within businesses, and the term whaling has been coined for these kinds of attacks.In the case of whaling, the masquerading web page/email will take a more serious executive-level form.These look much like the real website, but hide the text in a multimedia object.
This technique is by far the most successful on the internet today, accounting for 91% of attacks.
Some anti-phishing filters have even used IWR (intelligent word recognition), which is not meant to completely replace OCR, but these filters can even detect cursive, hand-written, rotated (including upside-down text), or distorted (such as made wavy, stretched vertically or laterally, or in different directions) text, as well as text on colored backgrounds.
Once a victim visits the phishing website, the deception is not over.
However, this has led to the evolution of more sophisticated anti-phishing filters that are able to recover hidden text in images.
These filters use OCR (optical character recognition) to optically scan the image and filter it.