Steganography Explained: Hiding Data in Plain Sight Inside Digital Files

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Steganography is the practice of concealing the very existence of a message by embedding it inside ordinary files such as images, audio, or video, rather than simply encrypting its contents. The technique dates back to ancient Greece and was notably used by German spies in World War II, who shrank entire documents to the size of a period and hid them in letters. In digital form, it exploits the limits of human perception by altering the least significant bits of pixel or audio data in ways that are invisible or inaudible to people. A standard 1920×1080 PNG image, for example, can carry nearly 777 KB of hidden data without any visible change, though lossy formats like JPEG destroy such embedded information during compression. Steganography is often combined with encryption to create a system where an attacker can neither read nor prove the existence of a concealed message.

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ProgrammingDEV Community ·

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