WorkTrue: An Efficient and Secure Cloud-based Workflow Management System

This paper proposes an e-document workflow system called “WorkTrue” that supports secure, fine-grained access control and multiple digital signings for e-document workflow management implemented on cloud. We apply a ciphertext policy attribute-based encryption (CP-ABE) to enable the access control with data privacy-preserving for all signed documents stored in the cloud server. In addition, we present a dynamic workflow scheduling algorithm to dynamically schedule the workflow tasks to be run by VM instances (VMIs) from a single VM in a cloud. In our experiment, we developed a WorkTrue prototype as a proof of concept for validating its functionality. We also conducted performance evaluation to substantiate that our WorkTrue is efficient in practice.