Journal of Applied Sciences ›› 2015, Vol. 33 ›› Issue (6): 575-584.doi: 10.3969/j.issn.0255-8297.2015.06.001

• Special Issue: Information Security of Multimedia Contents • Previous Articles     Next Articles

Tripartite Trade System Based on Secure Watermarking

XIN Xin, QIAN Zhen-xing, ZHANG Xin-peng, DAI Shu   

  1. School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China
  • Received:2015-07-23 Revised:2015-11-09 Online:2015-11-30 Published:2015-11-30

Abstract: To ensure security of e-commerce, we propose a tripartite trade system based on secure watermarking. We add a third party (server) in the buyer-seller watermarking protocol. The seller sends his/her own image to the server, and let the server trade with the buyer. The seller first uses homomorphic encryption and spreading to embed the server's watermark in the original image and send the marked image to the server. Having received the marked image, the server uses spread-spectrum dither modulation to embed another watermark to be used for locating suspicious buyers who illegally distribute the image. The server then executes the buyer-seller watermarking protocol based on homomorphic encryption. In the tripartite trade of the e-commerce platform, the proposed system not only prevents both the server and buyer from being framed, but also can trace illegal distribution of any buyer or the server. The system also provides a solution to the secure online transactions for a large number of users.

Key words: buyer-seller watermarking protocol, homomorphic encryption, tripartite trade, secure watermark

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