Course 27 - Hacking Web Applications, Penetration Testing, CTF | Episode 9: Tools and Techniques for Concealing Information

In this lesson, you’ll learn about:

Steganography fundamentals, the practice of concealing information inside other media files such as images, audio, or video without visibly altering the carrier file.
Manual hiding techniques, including simple visual tricks like matching font color to background color and appending hidden data to files using command-line utilities.
Least Significant Bit (LSB) steganography, an advanced method that embeds hidden data within the smallest bits of image pixels, making changes imperceptible to the human eye.
Using Steghide, a command-line utility for embedding and extracting hidden messages from image and audio files with passphrase protection.
Analyzing metadata with ExifTool, which allows investigators to view and modify file metadata such as author details, timestamps, and embedded information.
Discovering hidden text with the strings command, a utility that extracts readable character sequences from binary files to uncover embedded messages or hard-coded credentials.
Command-line file manipulation techniques, including concatenating files in Linux (cat) or Windows (copy /b) to append hidden data within another file’s raw structure.
Practical lab application, reinforcing detection and extraction techniques through hands-on exercises involving metadata inspection, hidden message embedding, and forensic discovery methods.

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