Introduction
Steganography is the practice of concealing information within another, seemingly innocuous medium, so that the hidden data is not apparent to the casual observer. The term comes from the Greek words "steganos," meaning "covered" or "hidden," and "graphein," meaning "writing." Unlike encryption, which protects data by transforming it into an unreadable format, steganography hides the fact that any communication is taking place at all.
The process of steganography revolves around the idea of using a carrier medium to conceal the data. For example, in image steganography, small changes can be made to the pixel values, often in the least significant bits, to encode a message.
Steganography disguises the very act of communication by embedding information within a seemingly harmless file, such as an image, audio, video, or text. The hidden content remains invisible to anyone unaware of its presence, making this approach particularly useful for covert communication.
Task 1 - Image Steganography
IICSF Free Steganography Tool
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Task 2 - Audio Steganography
Free Audio Steganography Tool
Task 3 - Solve the Riddle
Tap on the correct image to Solve
Case Study
A government agency suspects that sensitive information is being leaked by an insider who is hiding classified data within innocent-looking images and sending them via email. The images appear perfectly normal to the untrained eye, but analysts believe they contain hidden messages embedded using least significant bit (LSB) steganography. The agency uses a steganalysis tool to analyze pixel variations and finds discrepancies in the pixel values that suggest the presence of hidden data.
How might the agency extract the hidden information from the altered pixels of the image without damaging the original file?
Answer Checker 1
What techniques can be used to detect and prevent the transmission of steganographic images in a secure communication network?
Answer Checker 2
Final Assessment
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