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An effective image content temper detection scheme that uses perfect hash model is proposed in this paper.Aiming at low detection failing rates and high detection successful rates in image tamper localization,the proposed scheme uses perfect hash model to overcome easy collisions of the random numbers to enhance the effectiveness in authentication procedure.This scheme embeds perfect hash information in the LSBs of the original image to protect image content.The experimental results demonstrate that the proposed scheme has a good performance and can be used for image authentication applications.