An authentication model towards cloud federation in the enterprise

► We propose an optimization to OAuth 2.0 that improves performance without jeopardizing security requirements. ► Our model is enhanced to solve the federation and marketplace challenge. ► Our model allows for the creation of a unified cloud identity. ► We provide a real-life case study to illustrate the performance of our protocol. ► Performance optimization are necessary for Enterprise adoption of OAuth 2.0 protocol.