This paper presents a fragile watermarking scheme based on integral wavelet transform.The proposed method uses the Quadtrees structures received by the wavelet decomposition

statistical information on the nodes and secret key to choose the locations where to embed the watermarks.One bit watermark information will be embedded into the right location.The method has some characteristics:(1) it is adapts to medical images authentication due to the high Signal-to-Noise when the watermark embedded into images;(2) ensures the fragileness of watermark when it combines with the statistical information of wavelet coefficient to choose the locations where to embed the watermark;(3) it has a strong orientation ability for tampering because of the characteristics of wavelet decomposition in the spatial-frequency domain;(4) uses the secret key to protect the proposed method.It can resist the malice attack even if opening the method. The experimental result shows that the proposed method adapts to the medical images authentication

it is less complexity and more practicability.