A number of ways exist to hide information in various ways, ranging from coding these methods LSB (least significant bit) - which are known to decide the level of noise or input tools for image processing or compression algorithms to change the characteristics of the image. Trying to compensation systems essential to encrypt the information if they have knowledge of the locations where confidential information has been included.
Tools include the level of deciding on ways to use the LSB input and processing noise. These methods are generally in Steganography relatively easy application in image and sound, you can hide a surprising amount of information with little effect if there is a vector
