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I used histogram attack on image with embedded text ASCII(LSB-method) and found the chi square value. All observed frequencies more than expected frequencies, that is tipical for empty image, and have almost the same difference. Also the p-value is too big, though the data is embedded. Why do we observe this phenomenon?

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    $\begingroup$ Surely the frequencies can't all be higher, unless the image got bigger? $\endgroup$ – user253751 Mar 20 at 14:59
  • $\begingroup$ no, embedded image has the same size as empty $\endgroup$ – Irene Mar 20 at 18:50

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