Digital watermarking method and device for resisting geometric scaling attacks

Abstract

The invention discloses a digital watermarking method and device for resisting geometric scaling attacks, and the method comprises the steps: enabling digital watermarking information to be embedded into an original image, obtaining a watermarking-containing original image containing the digital watermarking information, and carrying out the scaling of the watermarking-containing original image according to 1 / z times, and obtaining a scaled image; preprocessing the size data of the original image, embedding the preprocessed size data into the DCT low-frequency alternating-current coefficient of the zoomed image, and zooming the obtained image embedded with the size data by z times to obtain a published image; acquiring a published image suspected to be geometrically scaled and attacked, and extracting size data of the original image from the DCT low-frequency alternating-current coefficient of the published image; scaling the published image suspected to be geometrically scaled and attacked according to the size of the extracted original image to obtain a geometrically scaled and attacked restored image consistent with the size of the original image; and extracting digital watermark information from the geometric scaling attack restoration image. According to the method, geometric scaling attacks can be effectively suppressed, and the robustness is good.

Description

technical field

[0001] The invention relates to the field of information security, in particular to a digital watermarking method and device for resisting geometric scaling attacks. Background technique

[0002] Today, with the maturity of network technology, the superiority of digital resources is fully reflected, copying becomes easier, and the cost is extremely low. The high-speed and convenient Internet has become an important way to obtain digital resources. In order to meet the needs of digital resources, various digital resources such as images, graphics, audio and video have been gradually digitized. However, digital resources are not only convenient for people to use, but also provide convenience for pirates. At present, digital watermarking technology and digital fingerprinting technology are widely used to protect digital works such as digital images, graphics, audio and video. Among them, digital watermarking has been widely studied as an important technology for...

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