Apparatus and method for watermarking digital image

Abstract

A watermarking device for embedding a watermark into a digital image, a device for extracting watermark information from a watermarked image using a public key having a plurality of secret keys, and a device for identifying The unit secret key embeds a watermark into each area to generate a watermarked image whether the device is a copy of the content. The watermarking device includes: a watermark generating unit that divides a digital image into a plurality of regions, assigns a predetermined secret key to each divided region, and generates a watermark for each divided region using a corresponding secret key; and a watermark An embedding unit that generates a watermarked image of the digital image by embedding watermarks into corresponding regions, respectively, and combining the divided regions in which the watermarks are embedded. Since different kinds of keys are used when watermarking and extracting watermarked information, the watermark can be protected from illegal attacks.

Description

technical field [0001] The present invention relates to a digital image watermark for copyright protection of digital image content, and more particularly, to a watermark for generating a watermark by dividing an original image into a plurality of regions and assigning a predetermined secret key to each region An apparatus and method for extracting watermark information from a watermarked image using a public key including a secret key. Background technique [0002] Unlike analog content, digital content can be copied indefinitely without any data loss. Recent developments in the Internet have increased unauthorized use of digital content such as illegal reproduction or distribution. Therefore, digital watermarking techniques have been proposed to prevent illegal distribution of digital contents. [0003] Digital watermarking is a technology that embeds copyright information such as information about the copyright owner or distributor of digital content as a watermark that...

AI Technical Summary

Problems solved by technology

[0006] However, in traditional watermarking methods, the same secret key is used when generating and extracting the watermark

Therefore, when the internal information of the extractor is disclosed due to an attack on the extractor, since the disclosed information is the same as that of the embedder, the security of the entire system is threatened

Moreover, conventional fingerprinting inherently requires large cryptographic algorithms involving complex key generation processes

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