Zero Trust Federation: Sharing Context under User Control towards Zero Trust in Identity Federation. - Koudai Hatakeyama; Daisuke Kotani; Yasuo Okabe (PerCom Workshops, 2021)

Zero Trust Federation: Sharing Context under User Control toward Zero Trust in Identity Federation. - Koudai Hatakeyama; Daisuke Kotani; Yasuo Okabe (CoRR, 2022)

Key Management Based on Ownership of Multiple Authenticators in Public Key Authentication. - Kodai Hatakeyama; Daisuke Kotani; Yasuo Okabe (SEC, 2023)