IEEE Trans Image Process - A secret-sharing-based method for authentication of grayscale document images via the use of the PNG image with a data repair capability.

Tópicos

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Resumo

A new blind authentication method based on the secret sharing technique with a data repair capability for grayscale document images via the use of the Portable Network Graphics (PNG) image is proposed. An authentication signal is generated for each block of a grayscale document image, which, together with the binarized block content, is transformed into several shares using the Shamir secret sharing scheme. The involved parameters are carefully chosen so that as many shares as possible are generated and embedded into an alpha channel plane. The alpha channel plane is then combined with the original grayscale image to form a PNG image. During the embedding process, the computed share values are mapped into a range of alpha channel values near their maximum value of 255 to yield a transparent stego-image with a disguise effect. In the process of image authentication, an image block is marked as tampered if the authentication signal computed from the current block content does not match that extracted from the shares embedded in the alpha channel plane. Data repairing is then applied to each tampered block by a reverse Shamir scheme after collecting two shares from unmarked blocks. Measures for protecting the security of the data hidden in the alpha channel are also proposed. Good experimental results prove the effectiveness of the proposed method for real applications.

Resumo Limpo

new blind authent method base secret share techniqu data repair capabl grayscal document imag via use portabl network graphic png imag propos authent signal generat block grayscal document imag togeth binar block content transform sever share use shamir secret share scheme involv paramet care chosen mani share possibl generat embed alpha channel plane alpha channel plane combin origin grayscal imag form png imag embed process comput share valu map rang alpha channel valu near maximum valu yield transpar stegoimag disguis effect process imag authent imag block mark tamper authent signal comput current block content match extract share embed alpha channel plane data repair appli tamper block revers shamir scheme collect two share unmark block measur protect secur data hidden alpha channel also propos good experiment result prove effect propos method real applic

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