Multilevel threshold secret sharing in distributed cloud

Abstract

Security is a highlighted concern in cloud and distributed cloud systems. Threshold secret sharing scheme is a widely used mechanism to secure different computing environments. We split secret into multiple shares and store them in different locations using threshold secret sharing scheme. In this paper we propose a multilevel threshold secret sharing scheme to enhance security of secret key in a distributed cloud environment. We create replicas of secret shares and distribute them among multiple resource providers to ensure availability. We also introduce dummy shares at each resource provider to realize the presence of any outside attacker. Our experiment results show that our scheme is feasible and secure.