Watermarking and encryption scheme to secure multimedia information

Thanks to the development of information technology, fraud has multiplied, and many protection techniques have emerged to improve the security of our information, such as encryption, steganography and watermarking. In this paper we will present a novel scheme to secure multimedia information. Our aim is to increase the security of transmitted signals. First we improved an encryption algorithm based on chaotic iteration of the Logistics map. Then, we developed an algorithm to watermark information by using DCT method to insert message. Simulations and discussions of our method are presented to prove the efficiency of our proposition.