An Image-Based CAPTCHA Using Sophisticated Mental Rotation. - Yuki Ikeya; Masahiro Fujita; Junya Kani; Yuta Yoneyama; Masakatsu Nishigaki (HCI (24), 2014)

Chimera CAPTCHA: A Proposal of CAPTCHA Using Strangeness in Merged Objects. - Masahiro Fujita; Yuki Ikeya; Junya Kani; Masakatsu Nishigaki (HCI (22), 2015)

An Attempt to Memorize Strong Passwords while Playing Games. - Masahiro Fujita; Mako Yamada; Shiori Arimura; Yuki Ikeya; Masakatsu Nishigaki (NBiS, 2015)

Physical trust-based persistent authentication. - Masahiro Fujita; Christian Damsgaard Jensen; Shiori Arimura; Yuki Ikeya; Masakatsu Nishigaki (PST, 2015)