Real-value encryption of digital image utilizing fractional Fourier transform
Yue Wang · Optical Technique · 2008
A novel method of digital image real-value encryption is presented by utilizing a novel reality-preserving fractional Fourier transform.Image encryption and deeryption are performed based on the real-valuedness and index additivity of the reali- ty-preserving fractional Fourier transform.The input and encrypted data are respectively in the spatial domain and the reality- preserving fractional Fourier transformed domain determined by encryption keys.It resists statistic analyses effectively.In addi- tion,the encrypted image is real-valued,so it's convenient for display and storage.The simulation result shows that as a method of eneryption with simple keys,it does't bring data expanding,and is sensitive to parameters,with considerable robust- ness and security,which has a good prospect and practicability in information security field.