6 hours ago
- Steganography is the practice of hiding a message within another medium, such as using lemon juice for invisible writing.
- Images can be used for steganography by altering the least significant bits of pixel color components, which is imperceptible to human eyes.
- In a 32-bit RGBA image, modifying the last two bits of each color component allows storing up to 30 KB of data in an 800×600 image.
- This technique works only with lossless image formats like PNG.
- The article provides C++ implementation using Qt to encode and decode hidden messages in images.
- Example shows hiding and extracting a message in a Mona Lisa PNG image successfully.