)define steganography, why an attacker or criminal might use it, and what tools can be used by the investigator to determine if steganography has been used?

Explanation:

Steganography:

Steganography is a type of information hiding technique by embedding the information or message in other files that seems completely no clue like video file, image file, etc.

Here the information will be encoded in other looking innocent files like image files.

Attacker or criminal usage:

If a criminal wants to communicate to partners about a critical information about their plan and consider all the networks are under surveillance of police or intelligence agencies.

Now he can use steganography to communicate secretly with other.

The criminal can embed the message for example “hijack the aircraft A300” in a simple image of Niagara falls, the filtering system will not detect the message since it will consider the file as image file.

All the images in the network are subjected to steganography test is impossible one.

Thus criminals can use steganography for secret communication.

Tools used to detect Steganography:

There are so many steganography detection tools are available, some examples are:

Steganabara

Stegbeak

StegCraker

Steghide

sorry i dont know what you mean by this problem : c