Anonymous Watermarking Protocol for Vector Spatial Data

In this paper, with current cryptography theory and watermarking technology of vector spatial data, we design a watermarking protocol for vector spatial data. This protocol combines trusted third party protocol and buyer-seller protocol. In this protocol, digital signature technique is employed to identity buyer and seller involved in the trade of spatial data product. Trusted third party transforms watermark information used in the trade to ensure the secrecy. Anonymous mechanism is employed in this protocol, the buyer has the anonymity to protect its privacy. In the watermark embedding process, we make the embedding operation and the encrypted operation into an atomic operation, to protect the interests of consumers. In addition, all information is encrypted to prevent disclosure in every stage of the trade. After theoretical analysis, it shows that this protocol can solve the security aspects of watermarking protocol and can resist all kinds of attacks against the protocol.