Image Encrytion Using Block Based Transformation Algorithm
Encryption is used to securely transmit data in open networks. Each type of data has its own features, therefore different techniques should be used to protect confidential image data from unauthorized access. Most of the available encryption algorithms are mainly used for textual data and m...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Newswood Ltd.
2008
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| Subjects: | |
| Online Access: | http://eprints.usm.my/24971/1/Image_Encrytion_Using_Block_Based_Transformation_Algorithm.pdf http://eprints.usm.my/24971/ http://www.iaeng.org/IJCS/issues_v35/issue_1/IJCS_35_1_03.pdf |
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| Institution: | Universiti Sains Malaysia |
| Language: | English |
| Summary: | Encryption is used to securely transmit data in
open networks. Each type of data has its own features, therefore
different techniques should be used to protect confidential
image data from unauthorized access. Most of the available
encryption algorithms are mainly used for textual data and may
not be suitable for multimedia data such as images. In this
paper, we introduce a block-based transformation algorithm
based on the combination of image transformation and a well
known encryption and decryption algorithm called Blowfish.
The original image was divided into blocks, which were
rearranged into a transformed image using a transformation
algorithm presented here, and then the transformed image was
encrypted using the Blowfish algorithm. The results showed
that the correlation between image elements was significantly
decreased by using the proposed technique. The results also
show that increasing the number of blocks by using smaller
block sizes resulted in a lower correlation and higher entropy |
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