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Paper Abstract and Keywords
Presentation 2020-12-17 10:30
Key Icon Concealed Graphical Authentication System Using Image Distortion
Takayuki Kawamura (Tsukuba Univ.), Toshio Suzuki (TUS), Keiichi Zempo (Tsukuba Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Graphical authentication systems has an advantage over existing letters password systems in that it is easier to remember. However, there is a problem that graphical authentication system is vulnerable to Over-the-shoulder attacks. Nevertheless it is difficult to prevent Screenshot attacks because the pattern of the image on the authentication screen is always the same. In other words, there is a need to generate various patterns on the authentication screen. In this study, we propose a key icon concealed type graphical authentication using distorted images. Legitimate users can register an arbitrary icon as a key icon. The authentication screen is generated by layering randomly placed key icons on a background image and distorting the image with several image processing filters. The distortion process blurs the boundary between the background image and the key icon, and the authentication screen becomes an abstract pattern with the key icon hidden in the image. The user authenticates by selecting the position of the key icon in the skewed authentication screen. The proposed method not only changes the position of the key icon for each authentication, but also creates various patterns on the authentication screen by using different background images, which can prevent Screenshot attacks.
Keyword (in Japanese) (See Japanese page) 
(in English) Graphical Authentication System / Over-the-shoulder attacks / Screenshot / key icon / distorted image / / /  
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Conference Information
Committee HCGSYMPO  
Conference Date 2020-12-15 - 2020-12-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
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Paper Information
Registration To HCGSYMPO 
Conference Code 2020-12-HCGSYMPO 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Key Icon Concealed Graphical Authentication System Using Image Distortion 
Sub Title (in English)  
Keyword(1) Graphical Authentication System  
Keyword(2) Over-the-shoulder attacks  
Keyword(3) Screenshot  
Keyword(4) key icon  
Keyword(5) distorted image  
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1st Author's Name Takayuki Kawamura  
1st Author's Affiliation University of Tsukuba (Tsukuba Univ.)
2nd Author's Name Toshio Suzuki  
2nd Author's Affiliation Tokyo University of Science (TUS)
3rd Author's Name Keiichi Zempo  
3rd Author's Affiliation University of Tsukuba (Tsukuba Univ.)
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Speaker Author-1 
Date Time 2020-12-17 10:30:00 
Presentation Time 15 minutes 
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