Abstract: Nowadays, the risk of information dispersal during transmission through the communication channel has emerged as a real threat to the sender of the secret message, be it in the form of text or image. In the case of medical and military documents this is even more severe. To prevent this, an attempt has been proposed in the current research so that the problem can be solved efficiently and with ease and precision. The current research relies on the Shamir’s algorithm. It tries to perform visual cryptography by the application of method like dividing the input image in a number of shares followed by shuffling each share and transmitting them. The reverse process is applied at the receiver end so that a majority of problem of data leakage can be controlled. The main focus is to encrypt colored images, a challenging task and needs real attention.Cryptography attacks are highly undesirable and hence a need arise to devise an algorithm which can prevent these attacks is required and the same has been attempted in the current research work. The NPCR and Entropy values were achieved 99% and 7.75 bits respectively which are ideal.

Encryption, Decryption, Visual cryptography, Shamir’s algorithm.