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Verify Digital Signatures on All Indian Government PDF Documents

India has made enormous strides in digital governance. Today, nearly every major government document — from your Aadhaar card to your tax return — is available as a digitally signed PDF. These signatures provide legal authenticity and tamper-proof guarantees. Yet one common problem affects all of them: when opened in a standard PDF viewer, they show "Signature Validity Unknown." This comprehensive guide covers all major document types, their Certifying Authorities, and how VerifySign.in solves this problem in one place.

Trusted Certifying Authorities in India

India's digital signature ecosystem is governed by the Controller of Certifying Authorities (CCA) under MeitY. The CCA operates as the root trust authority and licenses sub-CAs who issue document-signing certificates. The major CAs relevant to citizen documents are:

• UIDAI — Unique Identification Authority of India (signs Aadhaar PDFs)
• NIC — National Informatics Centre (signs DigiLocker, Parivahan, e-District documents)
• CBDT — Central Board of Direct Taxes (signs ITR, Form 26AS, tax notices)
• GSTN — Goods and Services Tax Network (signs GST certificates, returns)
• MEA — Ministry of External Affairs (signs e-Apostille documents)
• CCA India — The root authority overseeing all of the above

All Major Document Types — Quick Reference

Document	Issuing Authority	Signing CA	Why Unknown
Aadhaar Card (PDF)	UIDAI	UIDAI / NIC	Not in AATL
PAN Card (DigiLocker)	NSDL / UTI-ITSL	NIC	Not in AATL
ITR Acknowledgement	Income Tax Department	CBDT	Not in AATL
Form 26AS	Income Tax Department	CBDT	Not in AATL
AIS (Annual Information Statement)	Income Tax Department	CBDT	Not in AATL
Driving Licence (DigiLocker)	Parivahan / MoRTH	NIC	Not in AATL
Vehicle RC (DigiLocker)	Parivahan / MoRTH	NIC	Not in AATL
Academic Marksheet (DigiLocker)	CBSE / State Boards	NIC	Not in AATL
GST Registration Certificate	GSTN	NIC / GSTN CA	Not in AATL
e-Apostille Certificate	MEA	MEA / NIC	Not in AATL

What Is LTV Embedding and Why Does It Matter?

Long-Term Validation (LTV) is a PDF standard (ISO 32000) that allows a verified signature to remain provably valid long after the signing certificate has expired or been revoked. When VerifySign.in processes your document, it embeds the complete verification chain — certificate chain, OCSP/CRL revocation data, and timestamp information — directly into the PDF file. This means the PDF carries its own proof of validity, independent of any external server or certificate trust list. Open it in ten years, on any device, and it will still show a green tick.

Why VerifySign.in Requires No Software

Traditional certificate-based verification requires each viewer to have the relevant root certificates installed locally. VerifySign.in takes a different approach: instead of asking you to configure your viewer, it embeds the verification proof into the PDF itself. The result is a document that is self-contained and universally trusted — without any software installation on your end or the recipient's end. This is the only approach that works reliably when sharing documents with banks, embassies, or employers who use different operating systems and PDF viewers.

Verify Any Indian Government PDF — One Tool

1. Go to verifysign.in.
2. Upload your government PDF — any of the document types listed above.
3. VerifySign.in automatically detects the signing CA (NIC, CBDT, UIDAI, etc.) and verifies the signature.
4. View the signer identity, certificate details, and signing timestamp.
5. Download the LTV-enabled verified PDF — green tick on every device, forever.