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steganography
Sign in to saveupright=1.4|thumb|The same image viewed by white, blue, green, and red lights reveals different hidden numbers.
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27 sectionsContents
- History
- Techniques
- Physical
- Social steganography
- Digital messages
- Steganography in streaming media
- Adaptive steganography
- Cyber-physical systems/Internet of Things
- Printed
- Network
- Additional terminology
- Countermeasures and detection
- Applications
- Use in modern printers
- Example from modern practice
- Alleged use by intelligence services
- Distributed steganography
- Online challenge
- Computer malware
- Steganalysis
- Stegoanalytical algorithms
- According to the information available
- According to the purpose sought
- See also
- References
- Sources
- External links
upright=1.4|thumb|The same image viewed by white, blue, green, and red lights reveals different hidden numbers.
Steganography ( ) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination. In computing and electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video. Generally, the hidden messages appear to be (or to be part of) something else: images, articles, shopping lists, or some other cover text. For example, the hidden message may be in invisible ink between the visible lines of a private letter. Some implementations of steganography that lack a formal shared secret are forms of security through obscurity, while key-dependent steganographic schemes try to adhere to Kerckhoffs's principle.