A novel model-based steganographic technique for JPEG images is proposed where the model, derived from heuristic assumptions\r\nabout the shape of the DCT frequency histograms, is dependent on a stegokey. The secret message is embedded in DCT domain\r\nthrough an accurate selection of the potentially modifiable coefficients, taking into account their visual and statistical relevancy.\r\nA novel block measure, named discrepancy, is introduced in order to select suitable areas for embedding. The visual impact of\r\nthe steganographic technique is evaluated through PSNR measures. State-of-the-art steganalytical test is also performed to offer a\r\ncomparison with the original model-based techniques.
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