A Novel Octuple Images Encryption Algorithm Using Chaos in Wavelet Domain
The advancements in the network and multimedia technologies have made information security more exigent and demanding. It brings new challenges to develop security methods that are credential enough to encrypt a number of images and generate a single encrypted image containing the information of all plain-images. Here, we propose a novel image encryption algorithm which has the efficacy of encrypting eight distinct plain-images simultaneously. Low frequency components of plain-images are selected and processed. The algorithm makes use of three chaotic systems to get visual effect of disorder, distorted and indistinguishable single encrypted image. The encryption/decryption processing operations such as chaos-based circular rotation and random mixing of pixels are carried out in wavelet domains. The one-dimensional chaotic maps are used to generate two chaotic key images needed for circular rotation. A two-dimensional chaotic map is employed for randomly shuffling the coefficients matrix received after mixing. The performance of proposed algorithm is analyzed through experimentation against pixels correlation, peak signal to noise ratio, key sensitivity and key space. It is found that the simulation results validate the effectiveness of the proposed octuple images encryption algorithm.
KeywordsOctuple image encryption Security Chaotic systems Circular rotation Wavelet domain
- 8.Zhao J, Lu H, Song XJ, Li J, Ma Y (2005) Optical image encryption based on multi- stage fractional Fourier transforms and pixel scrambling technique. Opt Commun 249(4–6):493–499.Google Scholar
- 17.Situ G, Zhang J (2006) Position multiplexing for multiple-image encryption. J Opt A 8(5):391–397.Google Scholar
- 23.Chen T H, Tsao KH, Wei KC (2008) Multiple-image encryption by rotating random grids. In: Eighth international conference on intelligent systems design and applications, 252–256 2008.Google Scholar
- 26.Wang XY, Shi QJ (2005) New type crisis, hysteresis and fractal in coupled logistic map. Chin J Appl Mech 23:501–506Google Scholar