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Cheque Truncation System (CTS) is an image based cheque clearing system to speed up the process of clearing the cheques. Financial frauds are being carried out by tampering the content of the cheque image. Therefore, there is a need of detecting this kind of tampering of images. This paper proposes a method to detect whether a cheque image has been tampered or not. A difference expansion based watermarking technique is applied for this purpose. Experimental results demonstrate that the proposed method successfully distinguishes between genuine and tampered cheque images.