A Lightweight Buyer-Seller Watermarking Protocol

Figure 1

Our proposed watermarking protocol. $Y_1$ is the seller's copy, and $Y_2$ is the buyer's copy. ${ℰ}_B(\cdot )$ is a hybrid encryption [23] with the public key of buyer. $h_S$ is the fingerprint of the original image, and it is signed by the seller (the signature is not shown here).