Performance Analysis of Visual Cryptography and Watermarking Algorithms

Images are a common source of data transfer in numerous domains. They can be a source for transferring confidential information across various mediums. As this practice has been adopted on a large scale, securing the images become a major important aspect. Our paper here is an attempt to aid the security of images and also to reduce the illegal tampering of images while transferring them. We aim to provide algorithms which are robust and imperceptible that help in enhancing the security of images and also provide an analysis of those algorithms. A technique for digital image watermarking and kn sharing is presented in this paper. Digital Image Watermarking is accomplished using functions such as the wavelet transform and cosine transform. Given an image as the input signal, the watermarks would be used to verify the image's validity. The scheme is resistant against certain threats and normal image processing actions. In the case of KN Secret Sharing a user-supplied key is used to encrypt the input image. Using the K out of N technique, the given image is further divided into N separate shares. Although these N shares can be distributed, the end user only requires K of them to produce the original image. The original image is still encrypted after it is recreated. The recreated encrypted image can be decrypted and the required image obtained using the authenticated key. Watermarking finds its applications in forensics and numerous such domains. Etc. KN Sharing can be used in Distributed systems and also in Data transfer systems.