A Secure DCT Image Steganography based on Public-Key Cryptography
 | International Journal of Computer Trends and Technology (IJCTT) |  |
| © - July Issue 2013 by IJCTT Journal | ||
| Volume-4 Issue-7 | ||
| Year of Publication : 2013 | ||
| Authors :Shahana T |
Shahana T"A Secure DCT Image Steganography based on Public-Key Cryptography"International Journal of Computer Trends and Technology (IJCTT),V4(7):2039-2043 July Issue 2013 .ISSN 2231-2803.www.ijcttjournal.org. Published by Seventh Sense Research Group.
Abstract: - —Steganography is the method of hiding information in a multimedia carrier. The carrier(cover) can be an image, audio or video. In this case image is taken as the carrier and the hidden information or secret information. So here dealing with image steganography. Gray level image is taken as both cover and secret images. This paper implements the steganography in frequency domain. A DCT transformation technique is used to convert the cover image from spatial to frequency domain. To provide more security public key cryptography is combined with steganography. A public key encryptionn algorithm RSA is used here. Secret image is encrypted before embedding in the cover image. PSNR value is calculated for both stego and extracted image. An analysis shows that high PSNR value is obtained when the size of secret image is less compared to the size of cover image.
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Keywords : — Steganography, frequency domain, DCT, RSA, Stego Image, PSNR.