Image encryption algorithm using wavelet packets and multiple chaotic maps

Abstract

This paper presents an improved image encryption algorithm using Haar wavelet packets decomposition and four chaotic maps. For the wavelet packets scrambling we propose a permutation based on the Baker chaotic map. To increase the entropy of the ciphered image and the key space of the cryptosystem two chaotic maps – the three-dimensional Arnold map, applied twice, and the tent map combined with the logistic map – are used. Matlab simulations show that, in each step, these chaotic maps increase the entropy of the encrypted images and the pixels’ decorrelation. Another benefit obtained using the four maps is the augmentation of the key space.