Secure Instant Messaging Protocol Preserving Confidentiality against Administrator. - Hiroaki Kikuchi; Minako Tada; Shohachiro Nakanishi (AINA (2), 2004)

Privacy-Preserving Collaborative Filtering Schemes. - Hiroaki Kikuchi; Hiroyasu Kizawa; Minako Tada (ARES, 2009)

Privacy-Preserving Collaborative Filtering Protocol Based on Similarity between Items. - Minako Tada; Hiroaki Kikuchi; Sutheera Puntheeranurak (AINA, 2010)