TPM Based Design for Enhanced Trust in SaaS Services

On the past decade, Trusted Platform Modules (TPM) have become a valuable tool for providing a high level of trust on locally executing software. Indeed, in addition to its availability on most commodity computers, TPM are totally free of cost unlike other available Hardware-Based devices while they o er the same level of security. Enhancing trust in SaaS services regarding the security and the privacy of the hosted SaaS application services can turn out to be a pertinent application scope of TMP. In this paper we present a design for a trusted SaaS model that gives cloud users more con dence into SaaS services by leveraging TPM functionalities combined with a trusted source code certifying authority facility. In our design, the cloud computing provider hosting the SaaS services acts as a root of trust by providing nal cloud users insurance on the integrity of the SaaS application service running on its platform. A new mechanism of multisignature is developed for computing a join signature of SaaS service software by the trusted authority and TPM. A prototype implementation of the proposed design shows that the integrity of SaaS application service before and after it was launched on a cloud provider platform is guaranteed at low cost.