I. Statutory Framework

1. Section 3 - Digital Signature [DSC]
Oldest form - asymmetric crypto system and hash function.

• Private key signs, public key verifies
• Issued by Licensed Certifying Authority (CCA) - eMudhra, Sify, NSDL
• Class 2, Class 3 DSC
• Used for Income Tax, GST, MCA filings, e-tendering

2. Section 3A - Electronic Signature [e-Sign] - Inserted by 2008 Amendment
Broader, technology-neutral category based on UNCITRAL Model Law on Electronic Signatures 2001.

Section 3A(1): Electronic signature satisfying conditions specified in Second Schedule shall be deemed reliable.

Second Schedule as of 2026 includes:

• Aadhaar e-KYC based eSign: Most used. Aadhaar holder does OTP / biometric authentication on UIDAI, Certifying Authority issues ephemeral certificate valid for 30 minutes and signs document. Governed by Electronic Signature or Electronic Authentication Technique and Procedure Rules, 2015.
• Other techniques notified: e-auth using PAN, etc.

Every Digital Signature is Electronic Signature, but not every electronic signature is Digital Signature.

3. Section 5 - Legal Recognition

Where any law requires signature, such requirement deemed satisfied if authenticated by electronic signature in prescribed manner.

This gives e-signature same status as wet signature.

4. Section 10A - Validity of e-contracts

Where contract formation, communication of proposals, acceptance, revocation expressed in electronic form, contract shall not be deemed unenforceable solely on ground electronic means used.

5. Section 4 - Legal recognition of electronic records
Electronic record deemed equivalent to paper if same information accessible for subsequent reference.

6. First Schedule - Where e-Signature NOT valid

IT Act does NOT apply to:
a) Negotiable instrument (other than cheque) - promissory note, bill of exchange
b) Power of attorney
c) Trust deed
d) Will and testamentary disposition
e) Contract for sale / conveyance of immovable property
f) Any class of documents notified by Government

For these, wet signature still mandatory. Supreme Court has held e-sign on these is invalid.

II. What Makes e-Signature Legally Valid? - Conditions

For Digital Signature to be "Secure Electronic Signature" under Sec 15 - Gets presumption under Sec 85B, 85C Indian Evidence Act:

a) Signature creation data unique to signatory and under sole control
b) Signature creation data linked to signatory alone
c) Any alteration to signature detectable
d) Any alteration to electronic record after signing detectable

If these satisfied, Court presumes document and signature not altered - burden shifts to challenger.

For Electronic Signature under Sec 3A:

Must be:

1. Reliable method - Second Schedule technique
2. Method used to identify signatory and indicate approval of information
3. Method reliable as appropriate for purpose

Aadhaar eSign satisfies this - because UIDAI authenticates identity via OTP/biometric.

Scanned signature / typing name / clicking I Agree is NOT statutory electronic signature under Sec 3/3A. It may still be valid contract under Indian Contract Act + Sec 10A, but does NOT get statutory presumption. You must prove by other evidence who clicked.

III. Landmark Case Laws

1. Trimex International FZE Ltd. vs Vedanta Aluminium Ltd. (2010) 3 SCC 1 - Supreme Court - Foundation of e-contracts

Facts: Bauxite supply contract for 3 years. No formal signed paper. Series of emails exchanged - offer, counter-offer, final acceptance via email. Vedanta later refused to perform, argued no concluded contract because no signed document.

Held: Supreme Court upheld e-contract.

"Once contract is concluded orally or in writing, mere failure to sign formal contract does not make it unenforceable. Email exchange demonstrating explicit consent constitutes binding contract if essentials under Section 7-8 Contract Act met."

Combined Section 10A IT Act + Section 4, 7 of Indian Contract Act - Contracts concluded electronically valid.

Effect: This is why all email contracts, purchase orders via email are now enforceable. Foundation for e-sign validity.

2. Tamil Nadu Organic Pvt. Ltd. & Ors. vs State Bank of India, AIR 2014 Mad 103

Facts: E-auction of secured asset under SARFAESI. Borrower challenged e-auction saying no valid signature, contract via electronic means invalid.

Held: Madras High Court applying IT Act:

"Contractual liabilities could arise by way of electronic means and such contracts could be enforced through law. Electronic signatures are treated as equivalent to traditional wet signatures and are legally recognised under Section 5 of IT Act."

3. State (NCT of Delhi) vs Navjot Sandhu @ Afsan Guru - Parliament Attack Case (2005) + Anvar P.V. vs P.K. Basheer (2014) 10 SCC 473 + Arjun Panditrao Khotkar vs Kailash Kushanrao Gorantyal (2020) 7 SCC 1 - Admissibility

These three cases define how e-signed document must be proved in court.

In Anvar P.V., SC held electronic record including e-signed contract must be accompanied by Section 65B(4) certificate - signed by person in charge of computer system describing system, its regular use, proper functioning.

In Arjun Khotkar, SC clarified: For bank statements / e-signed records, certificate under Bankers Books Evidence Act Sec 2A+4 satisfies 65B. Also, primary electronic record (original device) does not need certificate, secondary (printout) needs certificate.

If you produce e-signed agreement in court as printout without 65B certificate, it is inadmissible. This has led to dismissal of many ICICI Bank cases in Delhi - ICICI Bank Ltd vs Surbhi Gupta, Vinod, Kamini Sharma (2018) - Bank filed loan agreements with digital signatures but no 65B certificate - suits dismissed.

4. Union of India vs Namit Sharma (2010) - Delhi High Court - Validity of Digital Signature

Delhi High Court held electronic signature generated through asymmetric crypto system is reliable and can be treated as valid signature for authentication of electronic records. Set precedent for acceptance of DSC.

5. State Bank of India & Anr. vs Ajay Kumar Sood (2022) - Supreme Court Directive on Digital Signatures for Judgments

SC issued directives that all judgments and orders uploaded by courts/tribunals must be digitally signed to ensure authenticity. Criticized practice of uploading scanned copies of printed judgments. Recognized digital signatures as more secure than scanned wet signatures.

6. Nikhil Chawla vs State - Delhi High Court - E-sign for Bail?

Court accepted e-signed vakalatnama and affidavits during COVID via DSC / Aadhaar eSign as valid under IT Act read with Supreme Court's suo moto guidelines for virtual courts.

IV. Practical Compliance - When e-Sign is Valid vs Invalid

VALID with Aadhaar eSign / DSC:

• Loan agreements, service agreements, employment letters, NDAs, invoices, purchase orders, board resolutions (if Articles allow), rental agreements (less than 12 months and not requiring registration)

INVALID even with eSign - First Schedule:

• Sale deed of house - must be registered with wet signature
• Will - must be wet signed
• Power of Attorney for property sale
• Trust deed
• Negotiable instrument other than cheque

Best Practice to ensure enforceability:

1. Use Second Schedule notified method - DSC or Aadhaar eSign via licensed ASP (NSDL, Leegality, etc.), not just typed name image.
2. Capture audit trail - IP, time stamp, Aadhaar auth transaction ID, hash.
3. Ensure signer has intent - Add "Click to Sign" with explicit consent + OTP.
4. For court purposes, preserve original electronic record and get Section 65B(4) certificate from IT admin at time of taking printout.
5. For high value contracts (>Rs.10 lakh), use Class 3 DSC, not just Aadhaar eSign OTP - stronger presumption.

Burden of Proof: If opponent denies e-sign, you must prove:

• That signature creation data was under sole control of signatory
• That method reliable (Aadhaar auth logs from UIDAI)
• 65B certificate