This book focuses on the implementation of Image steganography and modifying the existing technique to add more security to a normal steganography technique. The Book emphasizes various techniques used in steganography with methodology, algorithm, MAT LAB implementation and implementation in Java.

There is data everywhere, in the form of images, text and audio/video files. Some data is very crucial or personal and needs to be kept confidential. For that reason, we have cryptography. Cryptography is the science of encrypting a message such that an unauthorized party cannot comprehend what that message means. Only those who possess the key can decrypt the message. There might be cases where just encrypting the information is not enough, since an encrypted message can raise suspicion.
Steganography is the science of hiding a message completely inside another form of data so that the existence of the actual message is not revealed during communication. It is possible to hide the image in any of the digital formats whether it is images, videos or even audio files. Images are popular because they are really frequent on the internet and hence do not arouse suspicion.
This book intends to give an overview cryptography with image steganography.

Excerpt

CHAPTER 1: CYBER SECURITY

1. CYBER SECURITY

CHAPTER 2: CRYPTOGRAPHY

2. CRYPTOGRAPHY
2.1. PROCESS OF CRYPTOGRAPHY

2.1.1. TRAITS OF CRYPTOGRAPHY

2.2. SYMMETRIC KEY CRYPTOGRAPHY
2.3. PUBLIC-KEY CRYPTOGRAPHY
2.4. HASH FUNCTIONS
2.5. COMMON AREAS OF CRYPTOGRAPHY

CHAPTER 3: STEGANOGRAPHY

3. STEGANOGRAPHY
3.1. DIGITAL STEGANOGRAPHY
3.2. USES OF STEGANOGRAPHY
3.3. WORKFLOW OF STEGANOGRAPHY
3.4. STEGANOGRAPHY USERS
3.5. STEGANOGRAPHY VS. CRYPTOGRAPHY
3.6. STEGANOGRAPHY USE BY CRIMINALS
3.7. STEGANOGRAPHY DETECTION
3.8. APPLICATIONS OF STEGANOGRAPHY

3.8.1. SECRET COMMUNICATION
3.8.2. COPYRIGHT PROTECTION

3.9. CHARACTERISTICS OF STEGANOGRAPHY
3.10. MODELS OF STEGANOGRAPHIC SYSTEM

3.10.1. TEXT STEGANOGRAPHY
3.10.2. IMAGE STEGANOGRAPHY
3.10.3. AUDIO STEGANOGRAPHY
3.10.4. VIDEO STEGANOGRAPHY

CHAPTER 4: IMAGE STEGANOGRAPHY

4. IMAGE STEGANOGRAPHY
4.1. ARCHITECTURE OF IMAGE STEGANOGRAPHY
4.2. TECHNIQUES FOR IMAGE STEGANOGRAPHY

4.2.1. SPATIAL DOMAIN TECHNIQUES
4.2.2. NORMALIZED HISTOGRAM
4.2.3. SPATIAL FILTERING
4.2.4. LEAST SIGNIFICANT BIT
4.2.5. THE BINARY PATTERN COMPLEXITY (BPC)
4.2.6. PIXEL VALUE DIFFERENCING (PVD)
4.2.7. TRANSFORM DOMAIN TECHNIQUES
4.2.8. SPREAD SPECTRUM TECHNIQUES
4.2.9. MASKING AND FILTERING TECHNIQUES
4.2.10. LSB BASED DATA HIDING METHOD

4.3. METHODOLOGY
4.4. BASIC STEGANOGRAPHY MODEL
4.5. ALGORITHM FOR STEGANOGRAPHY
4.6. PSEUDOCODE

4.6.1. ENCODER()
4.6.2. BIT MANIPULATION
4.6.3. DECODER()
4.6.4. BYTE DATA

CHAPTER 5: MATLAB IMPLEMENTATION

5. MATLAB IMPLEMENTATION
5.1. MATLAB TOOLBOX

5.1.1. COMMON FUNCTIONS USED IN MATLAB
5.1.2. GRAPHICAL USER INTERFACE (GUI)

CHAPTER 6: IMPLEMENTATION OF STEGANOGRAPHY TECHNIQUE IN JAVA

6. IMPLEMENTATION OF STEGANOGRAPHY TECHNIQUE IN JAVA
6.1. TEXT HIDING USING BIT PLANE

6.1.1. ALGORITHMS
6.1.2. OUTPUTS

6.2. HIDE IMAGE USING BIT PLANE

6.2.1. ALGORITHM
6.2.2. OUTPUTS

6.3. EXTRACTION OF HIDED TEXT

6.3.1. EXTRACT TEXT USING BIT PLANE
6.3.2. OUTPUTS
6.3.3. EXTRACT IMAGE USING BIT PLANE
6.3.4. OUTPUTS

Objectives and Key Themes

The objective of this book is to provide a comprehensive overview of cryptography and steganography, focusing on the implementation of image steganography techniques and enhancing their security. It explores various methods, algorithms, and implementations in MATLAB and Java.

Cybersecurity and the need for data protection
Cryptography techniques (symmetric and asymmetric key cryptography)
Steganography techniques and their applications
Image steganography algorithms and implementations
Comparison of cryptography and steganography

Chapter Summaries

Chapter 1: Cyber Security: This chapter introduces the concept of cybersecurity and its importance in today's digital world. It discusses various cyber threats, including phishing, malware, and ransomware. The chapter highlights cryptography and steganography as crucial methods for securing data and communications, emphasizing their roles in maintaining data confidentiality, integrity, and availability. The chapter also touches upon the increasing reliance on technology and the rising sophistication of cyberattacks, stressing the need for robust security measures.

Chapter 2: Cryptography: This chapter delves into the fundamentals of cryptography, explaining its purpose as a method for securing information through the use of codes accessible only to the sender and intended recipient. It details the process of encryption and decryption, highlighting the importance of cryptographic algorithms and their mathematical underpinnings, particularly Kerckhoffs's principle. The chapter differentiates between symmetric-key and public-key cryptography, outlining their respective strengths and weaknesses. It concludes by discussing common applications of cryptography in various aspects of modern life, such as online banking and secure communication.

Chapter 3: Steganography: This chapter explores steganography, a technique for concealing messages within seemingly innocuous media like images, audio, or video files. It contrasts steganography with cryptography, emphasizing that while cryptography obscures the message's content, steganography conceals the message's very existence. The chapter details various steganography methods, discusses its applications in secret communication and copyright protection, and addresses the challenges of steganography detection (steganalysis) and its potential misuse by criminals. Different types of steganography (text, image, audio, video) are also examined.

Chapter 4: Image Steganography: This chapter focuses specifically on image steganography, explaining its architecture and various techniques. It delves into spatial domain techniques (like LSB steganography, PVD, and histogram manipulation), transform domain techniques (like DWT and DCT), and masking/filtering techniques. The chapter provides a detailed explanation of the LSB-based data hiding method, highlighting its advantages and disadvantages, and then offers a comprehensive methodology, basic model, and pseudocode for implementing image steganography algorithms.

Chapter 5: Matlab Implementation: This chapter describes the implementation of image steganography techniques using MATLAB. It introduces relevant toolboxes and functions within the MATLAB environment, including image processing functions for reading, writing, and displaying images, as well as functions for filtering and manipulating image data. The chapter also discusses the creation of graphical user interfaces (GUIs) in MATLAB to facilitate user interaction with the steganography tools.

Chapter 6: Implementation of Steganography Technique in Java: This chapter presents a Java implementation of steganography. It details the algorithms and implementation for hiding and extracting text and images within a cover image using bit-plane manipulation. The chapter includes diagrams and illustrative outputs demonstrating the process, including the user interface and the results of the encoding and decoding processes.

Keywords

Cryptography, Steganography, Image Steganography, Data Security, Cybersecurity, Encryption, Decryption, Symmetric Key, Asymmetric Key, LSB Steganography, Data Hiding, MATLAB, Java, Digital Image Processing, Information Hiding, Steganalysis, Security Algorithms.

Frequently Asked Questions: A Comprehensive Guide to Cryptography and Steganography

What is this book about?

This book provides a comprehensive overview of cryptography and steganography, with a strong focus on image steganography techniques and their security enhancements. It covers various methods, algorithms, and implementations using MATLAB and Java. The book aims to equip readers with a solid understanding of these crucial data security concepts and their practical applications.

What topics are covered in this book?

The book covers a wide range of topics, including: cybersecurity fundamentals, symmetric and asymmetric key cryptography, steganography techniques and applications, various image steganography algorithms and their implementation in MATLAB and Java, a comparison of cryptography and steganography, and a discussion on steganalysis (steganography detection).

What are the key themes explored in the book?

Key themes include the growing need for data protection in the digital age, the intricacies of cryptographic algorithms, the practical applications of steganography in various fields, the detailed analysis and implementation of image steganography algorithms, and the comparative advantages and disadvantages of cryptography and steganography approaches.

What are the main chapters and their respective focuses?

The book is divided into six chapters. Chapter 1 introduces cybersecurity; Chapter 2 details cryptography fundamentals; Chapter 3 explores steganography and its applications; Chapter 4 focuses specifically on image steganography techniques; Chapter 5 demonstrates image steganography implementation using MATLAB; and Chapter 6 showcases a Java implementation of steganography techniques.

What are the specific image steganography techniques discussed?

Chapter 4 delves into various image steganography techniques, including spatial domain techniques (LSB steganography, PVD, histogram manipulation), transform domain techniques (DWT and DCT), and masking/filtering techniques. The chapter provides a detailed explanation of the LSB (Least Significant Bit)-based data hiding method and its implementation.

How are MATLAB and Java used in the book?

MATLAB is used in Chapter 5 to implement and demonstrate image steganography techniques. The chapter explains relevant toolboxes and functions for image processing, including image manipulation and GUI creation. Chapter 6 details a Java implementation of steganography for hiding and extracting text and images using bit-plane manipulation, including algorithms and illustrative outputs.

What are the key differences between cryptography and steganography?

Cryptography obscures the content of a message, while steganography conceals the message's very existence. Cryptography relies on encryption and decryption algorithms, whereas steganography hides the message within another medium (like an image or audio file).

What is steganalysis?

Steganalysis is the process of detecting hidden messages within seemingly innocuous media. The book touches upon the challenges of steganalysis and its importance in ensuring the security of steganographic methods.

What are the practical applications of steganography?

The book discusses various applications of steganography, including secret communication and copyright protection. It also addresses the potential misuse of steganography by criminals.

What are the key algorithms and pseudocode presented?

The book presents algorithms and pseudocode for implementing image steganography, including the encoder, decoder, and bit manipulation functions. Specific algorithms are detailed in Chapters 4 and 6 for both MATLAB and Java implementations.

What are the keywords related to the content of this book?

Keywords include: Cryptography, Steganography, Image Steganography, Data Security, Cybersecurity, Encryption, Decryption, Symmetric Key, Asymmetric Key, LSB Steganography, Data Hiding, MATLAB, Java, Digital Image Processing, Information Hiding, Steganalysis, and Security Algorithms.

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Details

Title: Cryptography and Steganography. A multilayer Data Security Approach
Grade: 2
Authors: Jagdish Chandra Patni (Author), Hitesh Kumar Sharma (Author)
Publication Year: 2021
Pages: 86
Catalog Number: V1145619
ISBN (eBook): 9783346536006
ISBN (Book): 9783346536013
Language: English
Tags: cryptography steganography data security approach
Product Safety: GRIN Publishing GmbH

Quote paper: Jagdish Chandra Patni (Author), Hitesh Kumar Sharma (Author), 2021, Cryptography and Steganography. A multilayer Data Security Approach, Munich, GRIN Verlag, https://www.grin.com/document/1145619

Cryptography and Steganography. A multilayer Data Security Approach