Verification of the Effectiveness to Monitor Darknet across Multiple Organizations. - Katsuya Nishijima; Takao Kondo; Tatsumi Hosokawa; Tomohiro Shigemoto; Nobutaka Kawaguchi; Hiroyuki Hasegawa; Hideyuki Honda; Yasuhito Suzuki; Tadashi Kaji; Osamu Nakamura (CANDAR (Workshops), 2021)