Study and Realization of Encrypting and Hiding Images Algorithm Based on Dual Chaos Projections

The paper realizes dual encrytions of images by using Logistic and Lorenz chaotic systems to change the the locations and the sizes of Pixel values. The dual encrytions hide the encripted information in the carriers and prevent it from being noticed, improving the safety of the information transferred. The process of decryption is the reverse process of encription, which withdraws the information and undergoes anti-scrambling with secret keys to restore the images identical to original ones. The peak signaltonoise ratio between the restored pictures and the original ones is 21.78. The experiments prove that this method preserves the good ramdon of chaotic order. In addtion, it makes decipher really difficult and therefore improves the safety of the encrypted pictures.