A Review on Data Hiding upon Digital Images

Data hiding is one of the most important techniques for protecting communications in the Internet. It provides a secure method to distribute data through a public and unsafe channel. In this paper, we studied different data hiding methods. These methods were classified into two groups according to their reversibility; and finally, after arguing on each group based on their different features, we compared the performance of representative methods due to their capacity of secret data and bit rates. At the end, we concluded irreversible methods can be embedded by more secret data than a reversible method. However, increasing the capacity of embedded secret data can be done by some encoding methods.