Securing information using digital optics
Xiaogang Wang, Yixiang Chen · Journal of Optics A Pure and Applied Optics · 2007
We present a new method to secure information based on digital optics in this paper. The input image to be encrypted is recorded as interferograms by use of two-step phase-shifting interferometry. Before transmitting through communication channels, the interferograms are encrypted as phase codes in fractional Fourier domain by using a computer generated random phase mask. The set of fractional orders and the computer generated random phase mask form the keys to the encrypted data. With the phase shifts generated in the recording process, the original image can be retrieved from the correct decrypted interferograms successfully. Computer simulations are presented to prove its validity.