Enhancing Copyright Protection Through Blockchain and Ring Signature Algorithm From Lattice

Applying blockchain to copyright protection is currently a popular research trend. However, the characteristics of blockchain open data also lead to the threat of copyright privacy leakage. Targeting at this issue, we design a secure digital copyright protection scheme based on blockchain and ring signature algorithm, which can achieve privacy protection of copyright information and improve the efficiency of data authentication. In this paper, we design a new ring signature scheme based on lattice. In this scheme, by using the lattice basis delegation algorithm, user's public-private key pair is generated without expanding the dimension of lattice. Subsequently, according to the rejection sampling, message is signed by signer's secret keys and other ring participants' public keys. It can reduce scheme's computational complexity. Finally, by combining ring signatures with blockchain technology, a new copyright protection scheme is proposed. More importantly, this scheme is proven to be secure with its correctness and anonymity. Meanwhile, it has less communication costs and shorter key sizes than those in other similar schemes. The results show that the proposed new scheme has good performance and efficiency.