1. A method for detection of a plurality of attacks on a plurality of electronic media signals, characterized by a cross correlation based synchronous detection of watermark, the method comprising the computer implemented steps of: extracting object electronic media signals from the compressed electronic media signals by employing at least one decompressing means; instantaneously estimating plurality of parameters associated with at least one distortion or attack on the said object electronic media signals; synchronously generating a set of plurality of candidate templates configured with a predictively designed cross correlation filter for an instantaneous estimation of possible type and strength of distortion, attacks and combination thereof for an optimal correlation performance of at least one template therefrom; obtaining a Peak to Side lobe Ratio (PSR) score successively for each said template to determine a correlation output associated therewith each said template; obtaining a maximum PSR score associated with each said template for each frame of the said electronic media signal that results into one classifier per frame, wherein each classifier is configured to detect the watermark in a frame for score commensurating with a predefined threshold value; averaging the scores of the plurality of the classifiers associated with the plurality of frames of each said template; applying at least one fusion rule adapted to compare the averaged classifier score with the predefined threshold value or alternatively evaluate the percentage of maximum classifiers associated with plurality of frames commensurating with the predefined threshold percentage thereof to determine the watermark status in the plurality of frames of the electronic media signal; and deciding the presence of watermark, alternatively using at least one or combination of fusion rules, for determination of true positive associated with the attack.