Security of two recent constant-round password authenticated group key exchange schemes Raphael C.-W. Phan 2134/5688 https://repository.lboro.ac.uk/articles/conference_contribution/Security_of_two_recent_constant-round_password_authenticated_group_key_exchange_schemes/9557336 When humans interact with machines in their daily networks, it is important that security of the communications is offered, and where the involved shared secrets used to achieve this are easily remembered by humans. Password-based authenticated group key exchange (PAGKE) schemes allow group users to share a session key based on a human-memorizable password. In this paper, we consider two PAGKE schemes that build on the seminal scheme of Burmester and Desmedt. Weshow an undetectable online dictionary attack on the first scheme, and exploit the partnering definition to break the key indistinguishability of the second scheme. 2009-12-17 10:15:55 Password-authenticated key exchange Cryptanalysis Group Model Proof Mechanical Engineering not elsewhere classified