Homomorphic visual cryptography

Recently, a novel visual cryptographic scheme named homomorphic visual cryptographic scheme (HVCS) was proposed. The HVCS inherits the good features of traditional VCS, loss-tolerant, simply reconstructed method, and so on. Meanwhile, the HVCS can support signal processing in the encrypted domain (SPED), e.g., homomorphic operations and authentication. The HVCS can be used to protect the user's privacy as well as improve the security in online internet applications. In this paper, the HVCS is illustrated in detail and more useful HVC operations was exploited. Both the theoretical analysis and simulation results demonstrate the e ectiveness and security of the HVCS.