用浑沌序列构造相位列阵加密和解密光学图象

本文提出了一种用浑沌序列构造相位列阵加密和解密光学图象的方法,并对该光学系统进行了计算机模拟。由浑沌序列对初始条件的敏感性使保密性能提高,同时它又是由确定性系统产生的,故可以完全被重构。将它和纯相位空间光调制器结合起来能对光学图象实时进行相位加密和解密,不仅使密匙更难被非法破译,而且压缩了其数据量。结果表明该方法较随机相位掩模方法具有许多优越性且易于实际应用。

OPTICAL IMAGE ENCRYPTION & DECRYPTION USING CHAOTIC SEQUENCE TO CONSTRUCT THE PHASE ARRAY

In this paper a new method of optical image encry ption and decry ption using chaotic sequence to construct the phase array is presented. The optical system is studied by use of the computer simulation. Because this chaotic sequence comes from the determ inistic system and is very sensitive to the initial conditions, this kind of phase array can improve the security and also can be reconst ructed completely. Used this kind of phase array and the phase-only spatial light modulator, the optical image can be encrypted and ecrypted in real time. The data of decryption key is pressed and is high security. The results show that this met hod has more advant ages and more easy used than the encryption method using random phase mask.