Security Investigate

Content Aware Retargeting of Stego Images

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Executive Summary

Images play a vital role in steganography, as cover media to hide secret messages. Retargeting becomes mandatory while transmitting image in a heterogeneous network because sender and recipient may not have display devices of same resolution. Resizing images by scaling or cropping also lead to loss of visually important features. In steganography, resizing, compressing, and changing the color or format of stego images would result in loss of hidden information. In this paper, the authors attempt to retarget stego images in a content preserving manner using a modified seam carving technique called PSC. Content in this context refers to the visually salient features in the cover image as well as the secret message hidden within it.

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