APSS: Asynchronous Proactive Secret Sharing

Speaker: Fred Schneider

8th May 2003 , 2.30pm , Room 120 Claremont Tower

Abstract

A proactive secret sharing protocol enables a set of secret shares to be periodically refreshed with a new, independent set, thereby thwarting so-called mobile adversary attacks. This talk discusses APSS, a proactive secret sharing protocol for asynchronous systems. APSS resists denial of service attacks, which slow processor execution or impede message delivery and thus violate the defining assumptions of a synchronous system. An informal derivation of the APSS protocol will be given along with protocol transformations that have general applicability in the construction of secure and fault-tolerant distributed computations.