Robust Image Mosaic Scheme

Abstract

In this paper, we propose the crypto-stego technique which is combination of image steganography and cryptography as a tool for authentication. Steganography is the method of hiding any text, password, image or file behind and original cover media. Cryptography is an art of protecting information by encrypting it into unreadable format called cipher text only those who possess a secret key can decrypt message into plain text. A new approach for the secure transmission is proposed, which hide multiple secret image into a so-called mosaic image. The mosaic image, looks similar to a randomly selected secret images and may be use as a cover for secret images. Here, we are using 3-LSB bit substitution technique for image steganography and Bit Plane slicing algorithm is used to slice the mosaic image which is used as cover image. Advance cryptographic algorithm like Blowfish is used for encryption and decryption of data and images on both sender and receiver side.
Keywords: Steganography; Image Steganography; Cryptography; LSB; Encryption; Decryption; PSNR ratio; Mosaic Image; Cover Media; Slicing.