Fork-Resilient Continuous Group Key Agreement

ePrint Report: Fork-Resilient Continuous Group Key Agreement

Joël Alwen, Marta Mularczyk, Yiannis Tselekounis

Continuous Group Key Agreement (CGKA) lets a evolving group of clients agree on a sequence of group keys. An important application of CGKA is scalable asynchronous end-to-end (E2E) encrypted group messaging.


A major problem preventing the use of CGKA over unreliable infrastructure are so-called forks. A fork occurs when group members have diverging views of the group's history (and thus its current state); e.g. due to network …

application asynchronous called clients continuous current e2e encrypted end end-to-end eprint report fork history important infrastructure key keys major messaging problem report