ROBUSTNESS INCREASE OF DISCRETE COSINE TRANSFORM ALGORITHMS AGAINST FREQUENCY DOMAIN ATTACKS
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This article describes a way to increase a robustness of discrete cosine transform (DCT-based) algorithms. The Koch algorithm is used to show robustness against frequency domain attacks. The article illustrates a relationship between robustness and area of used DCT coefficients. JPEG compression, white noise, filters and resizing are used as external attacks. The ways of robustness increase are considered by optimal decision of embedding domains.