A novel image encryption algorithm based on discrete wavelet transform using two dimensional logistic map

In this paper a novel image encryption algorithm based on discrete wavelet transform (DWT) is proposed which uses two-dimensional logistic map as Private-Key. The algorithm uses Haar wavelet transform in order to generate image sub-bands which are used in encryption and decryption process and then two-dimensional logistic map is applied to the encrypted image in order to generate chaotic matrix which causes the encrypted image to be more secure. This chaotic matrix can also be used as a private-key in decryption process. The reversible proposed algorithm is evaluated with standard images and statistical techniques. The results show proposed algorithm possesses higher security and performance compared to the previous works.

I. Introduction

Nowadays, development of cryptography leads to improved multimedia transmission security in unsecure communicational networks. Image cryptography keeps safe information against unauthorized users and has various applications especially in military, communicational systems and aerospace. Wavelet transform (WT), as a powerful transform, can be used to improve image encryption because of its high resolution over Fourier transform.