IMAGE ENCRYPTION FOR SECURE INTERNET TRANSFER

Security is a crucial side to preserve the confidentiality of information such as pictures and text. The probability of an assailant attempting to access the image in the course of transferring process is high as assailant may get hold of important data. Therefore, encryption methods are used for securing the data. A novel image encryption algorithm that is a combination of the AES algorithm and the chaos sequence is proposed in this paper. The project will use AES for encryption and decryption of the image transfer because AES is capable of solving problem that cannot be resolved by different algorithms. The original image is transformed into cipher-image using a share secret key and this process is called encryption while the reverse of encryption process is known as decryption. This method’s sensitivity to the initial values and input image, even the tiniest changes within these values will result in significant changes in the encrypted image. We show that this approach can shield the image against different attacks exploitation using histogram analysis.

A Color Image Encryption Algorithm with Cat Map and Chaos Map Embedded

In order to deal with the problem of encryption algorithms being overly simplistic, and the relatively low security of color images that creates potential to be attacked in the transmission process, this paper will introduce a new encryption algorithm that is designed to divide color images into R, G and B layers. In the scrambling operation: the first scrambling is aimed to block the clear text image scrambling; The second scrambling is the dynamic Arnold scrambling of the ciphertext after the first scrambling. In the diffusion operation, the scrambled ciphertext image was taken as the input, and the pseudo-random sequence generated by Tent mapping and Sine mapping was embedded. The sequence generated by Logistic mapping was used to select sub-blocks for block diffusion of the image. Tent-Sine mapping was applied to the second diffusion to obtain the final ciphertext image. The algorithm designed in this paper combines image block scrambling and dynamic Arnold scrambling, the scrambling degree of each layer of image pixels would be greatly improved, thus improving the security of color images. In the process of diffusion, chaos sequence is selected for diffusion operation, which increases the difficulty of decoding ciphertext. The simulation results show that the new algorithm has desirable encryption effect, strong key sensitivity and large key space, and complex encryption algorithm can effectively resist attacks, which certainly has value in image information security.

Chaos based Encryption of Image for Secure Communication

The 20th century is known as the Information age. Development of technology led to the storing and communication of information in the digital form. Digital technology provides easy access to the information through internet and other forms of technology. Transmission of information is also become easy using digital technology. The information stored or communicated may be vulnerable to attacks from the adversaries. All the organizations and individuals are facing the threat of the insecurity of the information of data over the internet. Development of communication media and insecure media emphasizes the requirement to secure the data. The method of securing the information so that it is not stolen by the hackers is known as encryption. The development of multimedia technology has increased the images as the carriers of information. The conventional encryption algorithms are not well suited for the image encryption. Image encryption has developed in the past recent years as an important field. In the image encryption, the substitution and transposition techniques are performed on the pixel values of the image based on the key. One of the mechanisms for image encryption is based on chaos theory. Chaos sequence is used as a key for encryption because of its properties. This method of encryption is more secure and robust.