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Data Security using Discrete Cosine Transform (DCT) based Steganography and Blowfish Algorithm


D. Revathi , ALAGAPPA UNIVERSITY; Dr. E. Ramaraj, Alagappa University


Data Security, Image Steganography, Cryptography, DCT, Blowfish Algorithm


In today’s technology developments data securing is the complicated one to secure the transmitted data. Most of the data is transmitted on the network, so it is very hard to secure those processed data. So cryptography was introduced to protect the data from unauthorised access. A cryptography algorithm is used to convert the secret data to the unreadable form. Only the authorized person can access the original data. But only the cryptography technique cannot provide a better security approach, because, the scrambled message is still available to the eavesdropper. At this stage, the need for data hiding is raised. Steganography is one of the methods which hide the data on an image so that the viewer can’t detect the transmission of data and hence they cannot try to decrypt it. It is the process of embedding secret data in the cover image without any changes to the image. In this paper, a combination of steganography and cryptography techniques can be used for improving the security. This paper proposes a Blowfish- based cryptography algorithm is used to convert the secret message to ciphered format. The DCT based steganographic technique is performed the embedding steganography. Both of these algorithms keep the secret data from stealing, destroying and hence provide the security. The performance analysis of the proposed method is compared with existing papers and the quality metrics is measured by PSNR and MSE values.

Other Details

Paper ID: IJSRDV5I50977
Published in: Volume : 5, Issue : 5
Publication Date: 01/08/2017
Page(s): 780-783

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