  Information or data is very crucial resource to us. Thus securing the
information becomes all the more necessary. The communication media through
which we send data does not provide data security, so other methods of securing
data are required. Information hiding plays a very crucial role today. It
provided methods for encrypting the information so that it becomes unreadable
for any unintended user. This paper reviews the techniques that exist for data
hiding and how can these be combined to provide another level of security.
