Introduction Our results Conclusion

Introduction Our results Conclusion Password-based Group Key Exchange in a Constant Number of Rounds M. Abdalla, E. Bresson, O. Chevassut and D. Pointcheval ENS and CELAR and LBNL and ENS April 26th, 2006 M. Abdalla, E. Bresson, O. Chevassut and D. Pointcheval Password-based GKE in Constant Rounds Introduction Our results Conclusion 1 Introduction Authenticated Key Exchange Dictionary attacks Related work 2 Our results Dictionary attack on Dutta-Barua Key recovery attack on Lee-Hwang-Lee Our repaired protocol 3 Conclusion M. Abdalla, E. Bresson, O. Chevassut and D. Pointcheval Password-based GKE in Constant Rounds

• authenticated key


• constant-round protocols


• can eavesdrop


• active adversary


• dictionary attack


• lee-hwang-lee


• asymmetric authentication


• based group