日時: 平成20年3月20日(木)15時 30分 - 17時 00分

      場所: 場 所 情報科学研究科 5階 コラボレーションルーム7

      講演者氏名: Yvo Desmedt
          講演者所属機関・部局・役職名: The BT Chair of Information Security at University College London, UK. He is also a courtesy professor at Florida State University.

      講演題目:「Revisiting pairing based group key exchange」

      We propose new constant round pairing based group authenticated key exchange (AKE) protocols, which require lower computational complexity per user compared to previous proposals. Furthermore, one of our schemes is particularly interesting for groups in which some members enjoy more computational power than others. The protocol is most efficient if these members constitute roughly half of the group. If the parameters are chosen appropriately so that the pairing computations are fast the protocols can outperform traditional Burmester-Desmedt key exchange protocols. (This work is jointly with Tanja Lange and was presented at Financial Crypto 2008.)


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