The attacker used it for hiding the connection between him and the compromised system. Unfortunately, it can also be used by criminals to hide their crimes.Д¬riminals usually hide chunks of data inside the storage medium in invisible form by using system commands, and programs.ДЄ covert channel is a communication protocol which allows an attacker to bypass intrusion detection technique and hide data over the network. It is legitimately used for ensuring the privacy of information by keeping it hidden from an unauthorized user/person.

Anti-forensics techniques are categorized into the following types:. Digital forensic experts use forensic tools for collecting shreds of evidence against criminals and criminals use such tools for hiding, altering or removing the traces of their crime, in digital forensic this process is called Anti- forensics technique which is considered as a major challenge in digital forensics world. Digital forensic challenges are categorized into three major heads as per Fahdi, Clark, and Furnell (2013) these are:-ДЄs technology develops crimes and criminals are also developed with it. But these digital forensics investigation methods face some major challenges at the time of practical implementation. Digital forensics has been defined as the use of scientifically derived and proven methods towards the identification, collection, preservation, validation, analysis, interpretation, and presentation of digital evidence derivative from digital sources to facilitate the reconstruction of events found to be criminal.

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