In early days, information’s are shared in the form of text

messages. To secure those messages from unauthorized person AES and DES

algorithm are used for hiding the information. Later, due to the development of

technologies peoples starts to sending the information in the form

of images. In order to secure the images from hackers and unknown person become

a serious challenge in this digital world.

AES and DES algorithm are not suited for multimedia information due to

some characteristics like high data and high correlation among the pixels.

Those two algorithms are typically

designed for the purpose of textual information.1-3 Encryption is a efficient

method to solve these issues. Encryption

is a process which uses finite set of instruction called an algorithm to

convert original image to an encrypted form.A chaotic system is rich

in significance and in implication because of ergodicity and

pseudorandom sequences. These structures are too complex and difficult to

analyze . one round of permutation and

substitution are done to get the accurate result. Here, the permutation and

substitution are done by row by row / column by column instead of pixels by

pixels in order to increase the speed of encryption4.Wang Xing-Yuan at5

presented a image encryption based on chaotic system and cycle shift. Cycle shift

is a suitable for scrambling the images

and can also change the values in image pixels. It has large key space,

high level security encryption scheme

and resistive against known attacks.In6Based on RCA

combining chaos , In confusion step,each pixel of image is divided into units

of 4 bits to permute for permutation. Logistic map is used for generating the

keys and 2D RCA is used to achieve the bit level at diffusion stage. It belongs

to the symmetric system. Enayatifar at al7 Advanced their work by using

tinker bell chaotic map, DNA sequence and CA simultaneously. Here CA is used to

generate pseudorandom numbers . For encryption chaotic map is combined with

Tinkerbell chaotic mapping.Wang Leyuan8 proposed a color image encryption

based on two complex chaotic system. The main purpose of this paper is to mix

RGB channel by using pseudorandom numbers . So, in confusion step pixels are

modified by using 2D process and one step process. The mix of RGB channel leads

to multilevel encryption.