Digital Signature Certificate (DSC): What It Is, Class 3, and How to Get One (2026)

What a DSC actually is

A Digital Signature Certificate (DSC) is an electronic credential issued by a licensed Certifying Authority under the Information Technology Act, 2000. Signing a document with a DSC proves two things at once: who signed it, and that nobody has altered it since. A digitally signed filing carries the same legal weight as a handwritten signature and is admissible in Indian courts.

The tamper-evidence is the clever part. Change so much as a comma in a signed document and the signature breaks, the recipient sees immediately that it was altered after signing. This is what lets government portals accept your filing at 2am on a Sunday without any wet signature, courier or notarisation.

Why Class 3 is the only class now

DSCs used to come in classes, and you may still see references to Class 1, 2 and 3. In practice that history no longer matters for a business:

• Class 1 only confirmed a name and email, a low-assurance certificate, phased out as a standalone official-use category.
• Class 2 was the workhorse for MCA, GST and income tax filings, but its issuance was discontinued from 1 January 2021 by the Controller of Certifying Authorities.
• Class 3 is now the single standard issued for all business and government use. It covers everything Class 2 used to handle, plus high-assurance uses like e-tenders and e-auctions.

Signing, encryption, or both

Within Class 3, a DSC comes in up to three flavours, and picking the right one saves a wasted purchase:

• A Signing certificate authenticates you and protects document integrity, this is what you use to sign returns and forms.
• An Encryption certificate keeps a document confidential by encrypting its contents.
• A combined (Signing plus Encryption) certificate bundles both on one token.

For routine statutory filing, a Signing certificate is enough. But most e-procurement and e-tender portals require the combined certificate, you need the signing part to submit a bid and the encryption part to decrypt tender documents. If you tender for contracts, buy the combo.

Where a DSC is used

The strength of a single Class 3 DSC is that it works across nearly every government portal, as long as it is linked to the right PAN:

• MCA21 / MCA V3, for company and ROC filings.
• Income tax e-filing, including audit report submission.
• GST, for companies and LLPs, where DSC signing is mandatory.
• EPFO, ICEGATE, DGFT, GeM, and the trademark and patent (IP) office.
• Every e-tender and e-procurement portal.

Validity, the token, and renewal

A Class 3 DSC is issued for 1, 2 or 3 years. A longer validity lowers the per-year cost and spares you frequent renewals. When it expires you simply renew online, and renewal is usually cheaper than a first issue because you reuse the existing token.

The certificate must be downloaded to and stored on a FIPS-certified USB crypto token, a small device like a pen drive that keeps the private key from being copied or misused. Since 31 March 2023, only new-series tokens are compatible for downloading certificates. A good habit: renew at least 30 days before expiry so a lapsed certificate never blocks a filing deadline.

How to obtain one

The process is now fully online for most applicants:

• Apply through a licensed Certifying Authority, choosing individual or organisation type, the class (Class 3) and the validity.
• Complete video-based eKYC, Aadhaar and PAN based verification with a short recorded video has largely replaced in-person verification. No office visit is needed.
• The certificate is issued and downloaded to your FIPS token.

Foreign nationals can also obtain a DSC in India, with a valid passport as the mandatory identity document plus address proof. If you would rather not navigate certifying authorities, tokens and portal utilities yourself, our team handles DSC issuance and setup as part of getting your filings running.

Quick answers

What is a DSC? The legal digital equivalent of your signature, issued under the IT Act, 2000. Which class do I need? Class 3, the only class issued since Class 2 was discontinued in 2021. Signing or encryption? Signing for filings; the combined certificate for e-tenders. How long is it valid? 1 to 3 years, on a USB token. Where does it work? MCA, GST, income tax, DGFT, EPFO, GeM and more, one DSC covers all. Want it sorted? Our DSC service handles issuance and setup.