Evaluation Performance of Cryptography-Stenography using PSNR and BCR Result

In recent past few years, information sharing and transfer has increased exponentially using Digital Communication, internet technology, and while sharing data, it is important that communication must be faithful and secure. The threat of an intruder accessing secret information has been an ever existing concern for the data communication experts. Cryptography and Steganography are two popular ways of information exchange in a secret way, where Steganography hides the existence of the message and the Cryptography distorts the message itself. In Cryptography techniques, the data is encrypted and results into some useless form and then the encrypted data is transmitted, which always comes under the suspect to be have a secrete message. In steganography techniques, data is embedded in a cover file (normally digital image or video) and the digital file is transmitted. If the digital file is tested with steganalysis tools, then secrete data may be easily explored. In either ways, weather cryptography or steganography is used, though it is always chance that hidden message is getting detected. In order to improve the security, fusion of cryptography and steganography is used, known as cryptography-steganography. In this paper, important parameters are measured and comparative analysis is computed for various cryptography techniques used for crypto-steganography.