DSC (Digital Signature Certificate)

A Digital Signature Certificate is the electronic equivalent of a handwritten signature or a physical seal, issued by a government-licensed certifying authority, that lets someone sign documents and forms online in a way the receiving system can verify as authentic and tamper-evident. It's tied to an individual, not a company, so a director signs company filings using their own personal DSC rather than one issued to the business itself.

DSCs come in different classes, and Class 3 is now effectively the standard required for most regulatory filings, including MCA filings for company incorporation and annual returns, GST registration and returns above certain thresholds, and e-tendering. It's typically issued for one or two years and needs to be renewed before expiry, since an expired DSC simply stops working for filing purposes rather than issuing a warning in advance.

Getting a DSC requires identity verification (PAN, Aadhaar, and increasingly video verification) through a licensed certifying authority, and it's usually stored on a USB token for security rather than just as a downloadable file. For a company or LLP, at least one director or designated partner needs an active DSC before most ROC filings can even be attempted, which makes it one of the first practical things to sort out during incorporation rather than something to scramble for once a filing deadline is close.