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Cyber security attacks on various image data by anonymous unauthorized hackers, with the aim to intercept, corrupt or deny acess to the data, have seen a significant increase in recent years. Secure digital image communications on the internet and via networked systems is important in many multimedia commercial, government, and defense applications.. In many homeland security applications, digital information cloaking, and image watermarking have seen an increased interest by researchers, given the crucial need of protecting critical information that could threaten our nation security. In this paper we show, for the first time, a secure, high capacity, authentication, tampering localization, and self-recovery scheme that embeds, with very high imperceptibility, and hides DCT moments of several full gray-scale secret images (as opposed to binary) and several full grayscale watermarking images, of the same full size as a given arbitrary carrier/target host image. The information is embedded into the intensities (as opposed to the DCT moments as is the case of existing classical schemes, in general) of a host carrier/target image. We show how the proposed algorithm has self-recovery capability to recover most lost information in case of unauthorized cropping attacks from hackers. The objective is the ability, via a blind scheme where the carrier/target not required/known at the receiving end.

Blind Digital Image Information Cloaking and Authentication Scheme Using DCT