Enhancement of cryptography and transform domain in steganography for higher embedding capacity

In the field of Data Communication, security issues are the top priority.Cryptography and steganography address the necessary elements for secure communication namely privacy, confidentiality,key exchange,authentication,and non-repudiation but reveals the fact that communication is happening.This...

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Main Author:	Khalaf, Emad T
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://umpir.ump.edu.my/id/eprint/37047/1/ENHANCEMENT%20OF%20CRYPTOGRAPHY%20AND%20TRANSFORM%20DOMAIN%20IN%20STEGANOGRAPHY%20FOR%20HIGHER%20EMBEDDING.pdf
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id	my-ump-ir.37047
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spelling	my-ump-ir.370472023-02-20T02:25:19Z Enhancement of cryptography and transform domain in steganography for higher embedding capacity 2012-04 Khalaf, Emad T TK Electrical engineering. Electronics Nuclear engineering In the field of Data Communication, security issues are the top priority.Cryptography and steganography address the necessary elements for secure communication namely privacy, confidentiality,key exchange,authentication,and non-repudiation but reveals the fact that communication is happening.This study proposes a combination of Steganography and Cryptography to enhance security of the transmitted information.Hence this work is composed of two parts:cryptographic and steganographic.In the cryptographic part,an improvement has been proposed to the Hill cipher algorithm to be more secured by using a large and random key with large data block,and also extending it by including the special characters and digits.For the steganographic part,a new method has been proposed by combining Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT),to take the advantageous of both algorithms.The original image is decomposed into four bands using the Haar wavelet LL,HL,LH and HH.Three of these sub-bands have been selected to hiding data (LH,HL and HH)which are less effect to the image than LL sub-band.Then,DCT transform is applied to the selected DWT sub-band,the process of hiding will be in the least significant bit of the DCT coefficients to each sub-band. The distribution of data will be based on the chosen percentages,which is entered by a sender.These percentages will be agreed between both the sender and the receiver as a key of hiding.The proposed system goal is to provide more complexity in encryption and make the embedding capacity as high as possible with high visible quality in a way that it does not allow any attacker to even detect that there are secret messages.The complexity of encryption and concealment was checked out with a number of widely used metrics such as Peak Signal to Noise Ratio(PSNR),Mean Squared Error(MSE), Normalized Absolute Error (NAE) and Normalized Correlation Coefficient (NCC).The experimental results demonstrate the complexity of the proposed method compared with the standard and existing methods. 2012-04 Thesis http://umpir.ump.edu.my/id/eprint/37047/ http://umpir.ump.edu.my/id/eprint/37047/1/ENHANCEMENT%20OF%20CRYPTOGRAPHY%20AND%20TRANSFORM%20DOMAIN%20IN%20STEGANOGRAPHY%20FOR%20HIGHER%20EMBEDDING.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Computer System And Software Engineering Norazila, Sulaiman
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
advisor	Norazila, Sulaiman
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Khalaf, Emad T Enhancement of cryptography and transform domain in steganography for higher embedding capacity
description	In the field of Data Communication, security issues are the top priority.Cryptography and steganography address the necessary elements for secure communication namely privacy, confidentiality,key exchange,authentication,and non-repudiation but reveals the fact that communication is happening.This study proposes a combination of Steganography and Cryptography to enhance security of the transmitted information.Hence this work is composed of two parts:cryptographic and steganographic.In the cryptographic part,an improvement has been proposed to the Hill cipher algorithm to be more secured by using a large and random key with large data block,and also extending it by including the special characters and digits.For the steganographic part,a new method has been proposed by combining Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT),to take the advantageous of both algorithms.The original image is decomposed into four bands using the Haar wavelet LL,HL,LH and HH.Three of these sub-bands have been selected to hiding data (LH,HL and HH)which are less effect to the image than LL sub-band.Then,DCT transform is applied to the selected DWT sub-band,the process of hiding will be in the least significant bit of the DCT coefficients to each sub-band. The distribution of data will be based on the chosen percentages,which is entered by a sender.These percentages will be agreed between both the sender and the receiver as a key of hiding.The proposed system goal is to provide more complexity in encryption and make the embedding capacity as high as possible with high visible quality in a way that it does not allow any attacker to even detect that there are secret messages.The complexity of encryption and concealment was checked out with a number of widely used metrics such as Peak Signal to Noise Ratio(PSNR),Mean Squared Error(MSE), Normalized Absolute Error (NAE) and Normalized Correlation Coefficient (NCC).The experimental results demonstrate the complexity of the proposed method compared with the standard and existing methods.
format	Thesis
qualification_level	Master's degree
author	Khalaf, Emad T
author_facet	Khalaf, Emad T
author_sort	Khalaf, Emad T
title	Enhancement of cryptography and transform domain in steganography for higher embedding capacity
title_short	Enhancement of cryptography and transform domain in steganography for higher embedding capacity
title_full	Enhancement of cryptography and transform domain in steganography for higher embedding capacity
title_fullStr	Enhancement of cryptography and transform domain in steganography for higher embedding capacity
title_full_unstemmed	Enhancement of cryptography and transform domain in steganography for higher embedding capacity
title_sort	enhancement of cryptography and transform domain in steganography for higher embedding capacity
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Computer System And Software Engineering
publishDate	2012
url	http://umpir.ump.edu.my/id/eprint/37047/1/ENHANCEMENT%20OF%20CRYPTOGRAPHY%20AND%20TRANSFORM%20DOMAIN%20IN%20STEGANOGRAPHY%20FOR%20HIGHER%20EMBEDDING.pdf
_version_	1783732258513879040

Enhancement of cryptography and transform domain in steganography for higher embedding capacity

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