情報処理学会 第81回全国大会講演要旨

Secret handshake is a practical primitive that allows a group of authorized users to establish a shared secret key and authenticate each other anonymously. It provides a certain degree of user privacy and deniability which are also desirable for private conversations that require secure key establishment. Deniability allows authorized users to deny later their participating in conversations. This work investigate the deniability of existing secret handshakes, and show some of them can be attacked maliciously by constructing digital evidence which is not deniable.