This paper concentrates on the aspects and approaches of image hiding techniques and cryptosystem for digital images. Data hiding can be divided into two categories such as digital watermarking and steganography. With help of water mark methods we can hide the data in image. This paper could give introduction to digital image water marking methods and image encryption and decryption methods. Some of the security methods surveyed for medical image transmission from one device to another device over an internet. © 2016, International Journal of Pharmacy and Technology. All rights reserved.