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A Fragile Digital Image Authentication Scheme Inspired by Wet Paper Codes

Chang C-C., Chou Y-C.

Fundamenta Informaticae

2009

Vol. 90, nr 1-2

17-26

Image authentication is an important research topic of maintaining the integrity of digital image contents. Fragile image authentication is the technique for achieving the goal of image content integrity maintenance. This article presents a fragile image authentication scheme based on the concept of wet paper codes. The proposed scheme modifies dry pixels on an image to conceal an image signature. The proposed authentication scheme can exactly detect the tampered area on a tampered image. For saving computation cost of signature embedding, an exclusive-or operation is used in the proposed authentication scheme. The experimental results show that the proposedmethod not only has good visual quality of an authorized image but also successfully detects tampered areas on a tampered image.

High Capacity Data Hiding for Grayscale Images

Chang C-C., Chou Y-C., Kieu T.D.

Fundamenta Informaticae

2008

Vol. 86, nr 4

435-446

High embedding capacity and low image distortion factors are main concerns of information hiding researchers. No scheme can achieve these two factors simultaneously. The purpose of achieving either high embedding capacity or low image distortion varies from application to application. This paper presents a high embedding capacity information hiding method for grayscale images. The proposed method converts binary secret data into secret digits in the base-5 numeral system first. Next, one secret digit in the base-5 numeral system is embedded into one cover pixel. The experimental results show that the proposed method can be used to embed two secret bits into one cover pixel with the imperceptible image distortion. Comparing with some other works, we found that our method indeed outperforms all others in terms of embedding capacity.

A Large Payload Data Embedding Technique for Color Images

Chou Y-C., Chang C-C., Li K-M.

Fundamenta Informaticae

2008

Vol. 88, nr 1-2

47-61

This paper proposes a large payload data embedding method for color images. Under the fast advancement of digital equipments, color images have become a common medium in many applications. A color image can be represented in different color systems, for instance, RGB and YUV color systems. The proposed method modifies the blue value of the color pixel in order to imply the secret data because the blue value is an insensitive color to human eyes. Furthermore, the number of secret bits that can be embedded into a cover pixel is dynamic so the proposed method tries to embed the secret data as many as possible. The proposed method can be applied to both RGB and YUV color systems. However, for anti-stegoanalysis reason, the RGB color system is suitable for the proposed high capacity data embedding method with lower image distortion. The experimental results show that the proposed method is superior to other methods we compared in terms of embedding capacity and visual quality.