1. A method for detecting a tampered digital image; comprising: determining a reference noise pattern for a digital imaging sensor which created an authentic version of the digital image; regionally correlating the reference noise pattern with the digital image, to determine a regional correlation for respecitve regions having the same size and shape; detecting regions of the digital image which have been tampered based on at least identification of at least one region having an outlier correlation as compared to a plurality of other regions of the digital image; and outputting a signal corresponding to said detecting.