Information Security Technique in Frequency Domain
Thekra Abbas, Zou Beiji -, Maan younus abdullah - · International Journal of Digital Content Technology and its Applications · 2011
There have been many hidden communication techniques proposed in the last few years. The focus of this development was given to steganography to build such techniques. This paper presents a novel technique for Image steganography based on a frequency domain, where DCT is used to transform original image (cover image) blocks from spatial domain to frequency domain, and then Huffman encoding is performed on the secret messages/images before it is embedded in the frequency domain. The number of payload bits L is embedded into the DCT coefficient based on the DCT coefficient value of cover image in order to maximize the hiding capacity. It is observed that the proposed algorithm has better PSNR, Security and capacity compared to the existing algorithm.