In this case, is the integrity of the image still preserved after it is transmitted to the receiver? Was the image forged by the intruder during transmission? If someone sees the tampered picture, can he tell whether or not the original meaning of the image has been changed? How does one authenticate the accuracy of the image? Once the intruder tampers the image, can we detect it and then restore it back to the original image? Obviously, these questions are based on problems that have occurred.
For example, assume that a sender wants to transmit a digital image to a receiver, but an intruder intends to intercept the image, tamper it and spread it over the Internet. However, there are several associated problems that occur as a result of the convenience. Digital media with properties of portability and easy replication are suitable for communicating over the Internet. Information such as digital images is created and easily transmitted over the Internet. Currently, the World Wide Web is full of various information and knowledge, which allows users to browse and retrieve messages. Electronic commerce has also been developed for users to shop over the Internet. People use the Internet to communicate with each other via e-mail. The Internet has become an important part of our world as computer and communication techniques have progressed rapidly.
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