Stringent Authentication mechanism enhances secure TRACES access and centralized correction filing for banks and corporates. A centralized authentication mechanism requires banks and corporate deductors to route TRACES access for correction filings and certificate downloads through their Corporate Headquarter server, which validates branch login credentials and IP, produces a digitally signed encrypted payload submitted via HTTPS POST with specified parameters (including PAN, TAN, authorised person details, contact and timestamp), and enables TRACES to authenticate particulars and grant TAN account access; phased migration and listed unauthorized-access scenarios are provided.