DCT Coefficient Manipulation
Definition
A transform-domain technique that embeds data in the discrete cosine transform coefficients of a JPEG block, operating within the compressed representation rather than raw pixel values.
Related terms
- Carrier (Cover Object)
- The original file, image, audio recording, or video clip used to conceal the hidden message. The modified version containing the hidden data...
- Covert Channel
- Any communication path that was not intended by the system designer and that bypasses access-control or monitoring policies. Network covert channels are...
- LSB Substitution
- Least-significant-bit substitution: the lowest-order bit of each sample value (pixel colour channel or audio sample) is overwritten with one bit of the...
- Payload
- The action the malware performs once active: data encryption (ransomware), credential theft (banking trojan), resource hijacking (cryptominer), or system destruction (wiper). The...
- Steganography
- Concealing one file inside another in a way that hides the existence of the hidden file. LSB image manipulation, JPEG DCT coefficient...
Explained in
- Steganography Methods in Images, Audio, and VideoA transform-domain technique that embeds data in the discrete cosine transform coefficients of a JPEG block, operating within the compressed representation rat...