Cloud-based Buyer-Seller Watermarking Protocols

In this paper, we expand the well-known Buyer-Seller protocol to Cloud computing environment, in which the well-performed improved spread spectrum watermarking scheme is included to enhance the overall system performance. Depending on the service mode the Cloud provided, two Cloud-based Buyer-Seller protocols are proposed. In the first Cloud based Buyer-Seller protocol, Cloud behaves as a service infrastructural provider. That is, Seller uses Cloud to speed up his watermark embedding process and save storage and bandwidth costs required to store and to deliver encrypted contents. In the second protocol, Cloud behaves as a service platform provider. That is, Cloud behaves as an E-commerce platform to activate the content transaction between Seller and Buyer directly. Owing to Clouds great computation power and its very economical Pay-as-you-go business model, with the aid of the proposed Buyer-Seller protocols, we can build an efficient, effective, fair and secure Cloud-based E-commerce platform for media trading.