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Steganography

Steganography

课程: ISC2 Certified Information Systems Security Professional (CISSP) (2024) Cert Prep

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Steganography

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- [Instructor] Steganography is the process of hiding information within another file so that it is not visible to the naked eye. It's the art of hiding information in plain sight, and it's a particularly valuable communication secrecy tool for those who do not want others to know that they are even communicating in the first place. One of the most common steganography techniques involves hiding text within an image file. Image files are quite large and contain millions of individual pixels, each of which is shaded an individual color. That's the reason that we talk about the resolution of a photo in terms of megapixels. A 30 megapixel image has 30 million individual pixels. Steganography makes slight modifications to these pixels, perhaps adjusting the shade of a pixel by one or two tones to create a hiding space for other information. If steganography slightly adjusted the shade of a few thousand of those 30 million pixels, you'd never be able to notice the difference in practice…

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