Steganography is the art of hiding data within other data. Ann sends a message to Bob. With encryption Eve could see the message but not read it. With steganography Eve would not see the message.

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JPEG file SOS marker before SOF

I'm looking over some JPEG files with an assumption that a steganography has been used for trial obfuscation due to the installation of JPHS. I've come across a file where the start of scan marker ...
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Application of digital watermarking for session hijack

I know digital watermarking can protect the media from man-in-middle and replay attack. Is it good also for session hijack attack or phishing attack?