• Jyotirmoy Bharali
• Laxman Sahoo

Steganography is the practice of encrypting coded information within a document. It is often used in the same way as encryption, which prevents confidential data access without the proper tools or techniques used by experts in steganalysis. It has applications in various media sources such as text, images, video, audio, network channels, etc. This paper focuses on the image steganography technique using Discrete Cosine Transform and Least Significant Bit Substitution. The cover image is an RGB image. It is converted into YCbCr color space before a 2-D DCT is applied, where secret information is embedded. The inverse 2-D DCT is applied, and the image is converted back to RGB to give the stego image. The quality of the image was measured using PSNR (Peak Signal to Noise Ratio), MSE (Mean Square Error) and SSIM(Structural Similarity Index). Results showed a good quality stego image and low time complexity of the embedding and extraction algorithm.

Steganography,DCT, LSB, MSE, PSNR,RGB,YCbCr,SSIM

"A Fast Hybrid Image Steganography Approach with High Fidelity", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 5, page no.e472-e480, May 2022, Available :http://www.jetir.org/papers/JETIR2205559.pdf

"A Fast Hybrid Image Steganography Approach with High Fidelity", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 5, page no. ppe472-e480, May 2022, Available at : http://www.jetir.org/papers/JETIR2205559.pdf