A Semi-Fragile Image Content Authentication Technique based on Secure Hash in Frequency Domain

Image Authentication techniques enable the recipients to verify the integrity of the received image. In this paper, a semi-fragile image authentication technique based on secure hash generated with Orthogonal Polynomials based Transformation (OPT) coefficients is proposed. In this proposed scheme, the content based image feature is extracted from the OPT domain and the image hash which is used to verify the originality of the image is generated using the extracted features. In order to make the proposed scheme robust to content preserving image processing manipulations, the inter-coefficient relationship among OPT coefficients is exploited. Experimental results indicate that the proposed scheme is semi-fragile that is, the scheme is tolerant to unintentional manipulations like lossy compression and additive noise while being sensitive to malicious attacks like replace and crop.