A Randomized Dot Pattern Character Encoding Scheme (R-DPCES) for Steganography

Randomization is popularly used in encryption techniques to improve cryptographic security compared to their deterministic counterparts. A cipher text is chosen randomly from a set of cipher texts matching the message to encipher a message. This paper proposes randomizing the existing DPCES to secure information transmission in a steganography system. The randomization concept is applied to a flexible DPCES, a Character Binary encoding scheme used in steganography. This would significantly improve the effectiveness of defense against statistical analysis aimed at revealing the message of suspecting the steganography method is under attack. Knowledge of the exact mapping dot pattern applied to encode the message is required to extract the message. An attacker's probability of knowing the encoding scheme would be very low, if not zero. Thus, the Steganography system becomes highly secured with a randomized encoding scheme. The binary data is computed using R-DPCES and inserted into the cover. The stego-cover is transmitted to the intended recipient through the public channel.