By: Batch-17

Pradeep Surapaneni Raju Kommula.

Under the Guidance of: K V Muthyalu

Chaotic Image Encryption Techniques

A project seminar on

With the Co-ordination of: MD Mir Khasim

Contents

Abstract Introduction Objective Modules Requirements Existing System Proposed System Experimental Analysis Security Analysis Architecture Design Screen Shots Applicability Conclusion

Abstract

In this paper, we will provide an overview of the mechanisms used in image protection, especially Chaos-based encryption techniques available today. We will see how previously proposed methods such as Data Encryption Standard (DES), Triple Data Encryption Standard (Triple-DES), and International Data Encryption Algorithm (IDEA) have been applied in image protection domain and how new concepts of Chaos-based encryption techniques are superior to traditional methods.

The chaotic system is rich in significance and in implication because of sensitivity to change initial conditions, control parameters, ergodicity, random-like behaviour, repeated processing and very high diffusion and confusion properties that are desirable for cryptography.

Introduction

Advances in space science, data analysis, and communication technologies present new opportunities for users

The chaotic system was a new innovation because it can change

To increase productivityReduce costs Facilitate innovation and Create virtual collaborative environments for addressing the new challenges.

Initial conditionsControl parameters Ergodicity, and Very high diffusion and Confusion properties that are desirable for Cryptography.

Objective

The main Objective was to provide a Image encryption mechanism which provides high security level, less computational time and power in reliable and efficient way to deal with balky, difficult and intractable data.

Modules

Administrative o Maintains the user accountability

o Controls the user activities

Encryption Module

o Selects the image o Providing key for Encryption

Decryption Module

o Enter the key for Decryption

File Transfer ModuleWhich transfer file in Networking

Requirements

Hardware Requirements – Processer : Pentium IV 2.0 GHz and above Hard Disk : 10 GB RAM : 256 MB Software Requirements - Operating System : Windows IDE : My Eclipse Frontend : J2EE Coding Language : Java Backend : My SQL Other Technology : Tomcat Server  

Existing System

There are traditional image encryption techniques like DES, Triple-DES and IDEA.

Limitations

• requires large data size• long computational time • high computing power.• not suitable for practical image encryption and for online communications

Proposed System

The conventional cryptographic algorithms are mainly based on discrete mathematics.

chaos-based cryptography is relied on the complex dynamics of nonlinear systems .

The image encryption algorithm includes two steps:

Firstly, the image fusion is completed between the original-image and the key-image.

Then the pixel values of the fusion image are encrypted by Henon chaotic system.

Image fusion

Graphics fusion technique can be used in image fusion. According to the image pixel, image fusion can be completed between the same size images. Image fusion is described as following:

E(i, j)=w ×(K(i, j)-O(i, j))+O(i, j)

Where w is parameter, K(i, j) is the pixel values of the key-image ,O(i, j) is the pixel values of the original-image, and E(i, j) is the pixel values of the fusion-image.

Encryption by Henon chaotic Algorithm

In our scheme, Henon chaotic system is adopted to encrypt the fusion-image.

Step1: The Henon chaotic system is converted into one-dimensional chaotic map which is defined as:

Xi+2=1-aX2i+1+bxi

Where a = 0.3 , b [1.07,1.4] .The parameter ∈ a , the parameter b , initial value x0 and initial value x1 may represent the key.

Step2: Set encryption key for the fusion-image, including structural parameters a , b and initial values x0 ,x1 . After image fusion, we adopt Henon chaotic map to change the pixel values of the fusion-image.

Experimental Analysis

Cntd..Experimental Analysis

Security Analysis

A good encryption scheme should be sensitive to the secret keys, and the key space should be large enough to make brute-force attacks infeasible.

In our encryption algorithm, the key-image and the initial values of Henon chaotic map are used as secret keys.

The key space is large enough to resist all kinds of brute-force attacks. The experimental results also demonstrate that our scheme is very sensitive to thesecret key mismatch.

Architecture

Sign in

Add image

Apply choatic algorithm

Network

Receive encrypted

image

Decryption of image

Design Use case diagram

Class diagram

User

username : stringDate : dateFiles : voidtype : stringmessage : string

Createfile()update()delete()save()close()View()

Send Imagemessage : string

name : string

date : dateencryption : void

getaudio()update()delete()save()close()view()

Receive Image

message : string

date : datedecryption : void

getfiles()update()delete()save()close()view()

Keytype : stringfile : voiddate : datetime : timeaudiofile : binarymessage : string

setencryption()setdecryption()getencryption()getdecryption()

create()delete()close()view()

Encryption Decryption

0..1 1..n

1..n

0..1

0..1

1..n

Screen Shots

Home page

Browse Input and Output File

Encryption image

File Transfer

Server Side

Client side file sending process

Receive the file Server

Decrypting image

Finally view of original file

Applicability

This encryption scheme is suitable for applications like

Internet image encryption

secure transmission of confidential information in the Internet.

Conclusion

The proposed algorithm has three merits:

The proposed algorithm has three merits: o The algorithm has a large enough key space to resist all

kinds of brute force attack.o The cipher-image has a good statistical propertyo The encryption algorithm is very sensitive to the secret

keys. o provides high security levelo less computational time o Both reliable and efficient way to deal with balky, difficult and

intractable data

The only disadvantage is that the application should be at both the sender and receiver in network system.

References

Xiao D, Liao X, Wong K, An efficient entire chaosbased scheme for deniable authentication, Chaos, Solitons & Fractals 23(2005):1327–1331.

Tang G, Liao X, Chen Y, A novel method for designing S-boxes based on chaotic maps, Chaos, Solitons & Fractals 23(2005):413–419.

www.ieee.org

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