An Information Security System Based on Optimized Pixel Mapping Method

In the field of communication system and internet, the information security is playing a crucial role. At the present time, communication through Internet is becoming popular and it should be accurate and secure. To make it reality, cryptography is very useful tool to protect the content of confidential data in many research areas. Another one, steganography is also commonly used to hide the existence of data into cover media known as text, image, audio and video. In this work, it is considered that the two most popular techniques (Cryptography and Steganography) should be combined to develop the strong and robust security system. At first, confidentiality and message authentication requirements are fulfilled with the help of Byte-Rotation Encryption Algorithm (BREA) and Secure Hash Algorithm-512(SHA-512). On the other hand, a new data hiding approach based on the optimization of Pixel Mapping Method (OPMM) also provides the system the higher embedding capacity with minimum degradation of stego image quality. To analyze the performance of the proposed OPMM, the comparison is also presented in terms of embedding capacity and Peak Signal to Noise Ratio (PSNR) values