Abstract
This paper describes a new steganography algorithm based on a steerable pyramid transform of a digital image and the steganalysis of the existence of secret messages hidden by this new method. The data embedding process uses the elements of a Lee and Chen steganography algorithm which is adapted to the steerable pyramid transform domain. This article describes the Fisher Linear Disriminant (FLD) analysis and its steganalysis application, too. The main part of the paper is the description of the conducted research and the results of FLD steganalysis of stegoimages produced by the new steganography algorithm.
Highlights
Steganography is a modern and dynamically developing part of information security which protects information by its hidding
The redundant data may be replaced by secret information using the steganography algorithm, too
We have developed a new steganographic method with a digital image as an information cover and based on a steerable pyramid transform
Summary
Steganography is a modern and dynamically developing part of information security which protects information by its hidding. Our research is concentrated on developing the most secure and efficient steganography method [3, 4, 5, 6] with digital image as a cover of the secret information. The proposed stego-algorithm is based on a steerable pyramid transformation of a digital image [8, 9, 10] In this linear multiresolution the image decomposition is subdivided into a collection of subbands localised in scale and orientation. Steerable pyramid transform: a) – the transformation filter structure, b) – the Fourier magnitude spectum with marked frequencies passed by the filters B0 and B1, c) – two levels of a sample image decomposition with four filtering directions.
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