Abstract: Since the 21st century, with the development of computer science and the perfection of digital-multimedia communication, people pay more attention to information security, image steganography technology is developed rapidly as a means to ensure information communication security. This paper proposes a color image steganography algorithm that utilizes the periodic features of model operation for information encryption. This algorithm introuduces a new steganography function and calculates the differences between the original image data and the secret data, and is combined with steganography function to get the amount of modification to achieve information hiding. This method realizes the information encryption and ensures a high embedding rate on the premise of security. Sufficient experiments show this algorithm has good image visual quality and information security performance, and a higher and more flexible embedding rate. Therefore, it can replace most color steganography algorithms.

Key words: color image, modular arithmetic, steganography algorithm, steganography function