Analysis of Varying Least Significant Bits DCT and Spatial Domain Stegnography

Abstract

Stegnography is a historical technique adopted for data security. Various techniques has been developed and adopted for the implementation of Stegnography. This paper focuses on Stegnography in DCT domain. It presents the statistical analysis of hiding capacity, the qualitative metrics used for the analysis of stego image for different combinations of least significant bits replacement, in DCT domain as well as Spatial domain are MSE, SNR and PSNR. Healthier results of MSE, SNR, PSNR and Stego image are observed with significant data hiding capacity achieved. A comparative analysis of spatial domain and DCT domain Stegnography is also made proving DCT a better domain for Stegnography practices at same hiding capacity level.