performed using phishing data obtained from Anti-Phishing Working Group, PhishTank, and an unnamed email filtering vendor. Another study, conducted by SmartWare for Mozilla and released November 14, 2006, concluded that the anti-phishing filter in Firefox was more effective than Internet Explorer by over 10%. The results of this study have been questioned by critics, noting that the testing data was sourced exclusively from PhishTank, which itself is an anti-phishing provider. The study only compared Internet Explorer and Firefox, leaving out (among others) Netcraft Toolbar and the Opera browser, both of which use data from PhishTank in their anti-phishing solutions. This has led to speculations that, with the limited testing data, both Opera and Netcraft Toolbar would have gotten a perfect score had they been part of the study. While the two directly aforementioned reports were released only one day apart, Asa Dotzler, Director of Community Development at Mozilla, has responded to the criticism of the Mozilla-commissioned report by saying, "so you're agreeing that the most recent legitimate data puts Firefox ahead. Good enough for me." Since these studies were conducted, both Microsoft and Opera Software have started licensing Netcraft's anti-phishing data, bringing the effectiveness of their browser's built-in anti-phishing on par with Netcraft Toolbar and beyond. See also Mutual authentication Two-factor authentication - note: almost all two-factor techniques are also susceptible to phishing. References External links Computer security software