Digital Image Processing

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Chaotic Image Encryption and Compression in Transform Domains


Affiliations
1 Dept. of Electronics and Electrical Communications, Tanta University, Egypt
2 Dept. of Electronics and Electrical Communications, Tanta University, Egypt
3 Dept. of Computer Science & Engineering, Menoufia University, Menouf-32952, Egypt
     

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There are two operations for fast and protected information transmission. The first, is an operation of encryption, which aims to modify the compressed information to make them unreadable to whoever does not have the necessary authorization to see them.
The second is an operation of compression which consists in reducing the size of information to be transmitted, by removing redundant information of them. However, these two operations are often carried out separately, although they are strongly bound and one influences on the other. We propose, in this article, to carry out these two operations (compression and encryption) together in different transform domains. The discrete cosine transform (DCT), the integer wavelet transform (IWT) and the discrete wavelet transform (DWT) are exploited in the proposed encryption approach. Chaotic encryption and lossy JPEG compression are performed in these transform domains to make use of the characteristics of each domain.
A comparison study between all transform domain encryption schemes and jpeg compression is held in the presence of different attacks.


Keywords

Chaotic Baker Map, DCT, DWT, IWT, Image Encryption, Lossy JPEG Compression.
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  • Chaotic Image Encryption and Compression in Transform Domains

Abstract Views: 142  |  PDF Views: 3

Authors

Ensherah A. Naeem
Dept. of Electronics and Electrical Communications, Tanta University, Egypt
Mustafa M. Abd Elnaby
Dept. of Electronics and Electrical Communications, Tanta University, Egypt
Osama S. Faragallah
Dept. of Computer Science & Engineering, Menoufia University, Menouf-32952, Egypt

Abstract


There are two operations for fast and protected information transmission. The first, is an operation of encryption, which aims to modify the compressed information to make them unreadable to whoever does not have the necessary authorization to see them.
The second is an operation of compression which consists in reducing the size of information to be transmitted, by removing redundant information of them. However, these two operations are often carried out separately, although they are strongly bound and one influences on the other. We propose, in this article, to carry out these two operations (compression and encryption) together in different transform domains. The discrete cosine transform (DCT), the integer wavelet transform (IWT) and the discrete wavelet transform (DWT) are exploited in the proposed encryption approach. Chaotic encryption and lossy JPEG compression are performed in these transform domains to make use of the characteristics of each domain.
A comparison study between all transform domain encryption schemes and jpeg compression is held in the presence of different attacks.


Keywords


Chaotic Baker Map, DCT, DWT, IWT, Image Encryption, Lossy JPEG Compression.