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3. M. Burnett. The pathetic reality of adobe password hints. http://xato.net/windows-security/adobe-password-hints. Last Accessed: 2015-04-20. M. Burnett. The pathetic reality of adobe password hints. http://xato.net/windows-security/adobe-password-hints. Last Accessed: 2015-04-20.
4. Tag Digit Based Honeypot to Detect Shoulder Surfing Attack