... middle of paper ...
...proach, the LSB of each byte of the cover file is replaced with bits from the message.
B. Injection approach. In the injection approach, the source message is hidden in sections of the cover file that are ignored by the processing application. Therefore, avoid modifying those file bits that are related to an end-user leaving the cover file perfectly usable.
(3) Substitution approach. In the substitution approach, the least significant meaningful content of the cover file is replaced with the source message in a way that causes the least amount of distortion to the cover file.
(4) Generation approach. It is different from injection and substitution; it does not require an existing cover file but generates a cover file for the sole purpose of hiding the message.
A large number of steganography algorithms have been developed utilizing the above all the four approaches.
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