Security toolbars in a web browser show security-related information about a website to help users detect phishing attacks. Because the toolbars are designed for humans to use, they should be evaluated for usability - that is, whether these toolbars really prevent users from being tricked into providing personal information. The authors conducted two user studies of three security toolbars and other browser security indicators and found them all ineffective at preventing phishing attacks. Even though subjects were asked to pay attention to the toolbar, many failed to look at it; others disregarded or explained away the toolbars' warnings if the content of web pages looked legitimate. The authors found that many subjects do not understand phishing attacks or realize how sophisticated such attacks can be.
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