Bringing Round-Robin Signature to Computer-Mediated Communication

with Takeo Igarashi


In computer-mediated group communication, anonymity enables participants to post controversial comments without risking accusations of improper behavior. While this may encourage more open and frank discussion, it diminishes accountability. In addition, anonymous comments are perceived as weaker than non-anonymous comments. We propose a communication protocol that allows a user to send a strong message to the group without having to assume sole individual responsibility. The system posts an anonymous comment, and then calls for supporters. When sufficient numbers of supporters have been gathered, the system reveals the names of all supporters as a round-robin signature. This prevents the originator from being identified.


  1. Takeshi Nishida, Takeo Igarashi, "Bringing Round-Robin Signature to Computer-Mediated Communication", Proc. ECSCW 2007, pp.219-230 (September, 2007).

in Japanese

  1. 西田 健志, 五十嵐 健夫, "傘連判状を採り入れたコミュニケーションプロトコル", 情報処理学会論文誌, Vol.51 No.1, pp.45-53 (January, 2010).
  2. 西田 健志, 五十嵐 健夫, "傘連判状を採り入れたコミュニケーションプロトコル", 第 123 回 HCI 研究会報告, pp.19-26 (May, 2007).
  3. 西田 健志, 五十嵐 健夫, "「あと一歩の勇気」を引き出すコミュニケーションインタフェース", 第 48 回プログラミングシンポジウム報告集, pp.153-160 (January, 2007).