Asymmetric image encryption based on optical interference using modified error-reduction phase retrieval algorithm
Lei Liu, Mingguang Shan, Zhi Zhong, Bin Liu
Abstract
Abstract In this paper, we propose an asymmetric interference based encryption (IBE) using a modified error-reduction phase retrieval algorithm (mERPRA) in a structure of optical interference. Unlike previously proposed IBE schemes, the ciphertext in our scheme has less pixels than the original image. What is more important, a plaintext-dependent private key can be retrieved by using mERPRA with a fixed amplitude constraint, which makes this IBE scheme asymmetric. As we know, except for equal modulus decomposition-based encryption schemes, this is the first time that asymmetric IBE is presented. Consequentially, our proposed IBE scheme gains enhanced security due to its asymmetry. Simulation results are demonstrated to prove the validity of this scheme.