Optical image asymmetric cryptosystem using fingerprint based on iterative fraction Fourier transform

摘要

A novel asymmetric cryptosystem for optical image is proposed using finger-print based on iterative fractional Fourier transform. To enhance the security, a hyper-chaotic phase generated by a 4D Lorenz system is considered as the public key in the proposed encryption system, while the private key is emerged by the retrieved phase and fingerprint. In the encryption process, the secret information is hid into the hyperchaotic phase. Subsequently, the private key can be obtained by a reversible operation. To decrypt the original image, the ciphertext and private key are imported into the input plane of fractional Fourier system. This system is also applicable for information authentication because the fingerprint is used both in encryption and decryption approach. Some numerical simulations have been done to test the validity and capability of the encryption system.