Difference Between Digital Signature and Electronic Signature

In today’s fast-paced digital era, signatures are no longer limited to pen and paper. From signing contracts to filing taxes, most activities can now be completed online without the need for physical presence.

This transformation has brought two terms into frequent use — Digital Signature and Electronic Signature. Though they are often used interchangeably, they have distinct legal, technical, and functional differences.

This article breaks down these differences in a simple yet detailed manner, with references to Indian law.

What is an Electronic Signature?

An electronic signature is a broad term that refers to any electronic method of indicating a person’s approval or consent to the contents of a document.

It can be as simple as:

• Typing your name at the end of an email
• Clicking an “I agree” button on a website
• Using a scanned image of your handwritten signature on a PDF

Definition under Indian Law

Section 2(1)(ta) of the Information Technology Act, 2000 defines electronic signature as:

“Authentication of any electronic record by a subscriber by means of the electronic technique specified in the Second Schedule and includes digital signature.”

This means an electronic signature could include:

• Digital signatures (a specific secure type)
• Other recognised electronic authentication methods

What is a Digital Signature?

A digital signature is a specific, highly secure type of electronic signature. It uses advanced cryptographic techniques to ensure authenticity and integrity.

Definition under Indian Law

Section 2(1)(p) of the Information Technology Act, 2000 defines digital signature as:

“Authentication of any electronic record by a subscriber by means of an electronic method or procedure in accordance with the provisions of section 3.”

It is created using:

• Public Key Infrastructure (PKI)
• A pair of keys:
  • Private Key (used to create the signature)
  • Public Key (used to verify the signature)

Digital signatures are issued and validated by licensed Certifying Authorities such as eMudhra, Sify, or (n)Code Solutions.

Layman’s Understanding

• Electronic Signature: Like signing a paper with a pen — but in digital form. It shows consent but may not always confirm the signer’s identity or prevent tampering.
• Digital Signature: Like a fingerprint — unique to you, verifiable, secure, and very difficult to forge. Any change in the signed document will make the signature invalid.

Key Legal Differences Between Digital Signature and Electronic Signature

In simple terms, all digital signatures are electronic signatures, but not all electronic signatures are digital signatures. Legally, digital signatures provide stronger authentication, higher security, and greater acceptance in official transactions. Businesses and professionals should choose the right form based on the risk level, legal requirements, and nature of the transaction.

Technology Used

• Electronic Signature: Technology-neutral; can be created using scanned handwritten signatures, typed names, click-to-accept buttons, or OTP-based authentication. No mandatory encryption standards are prescribed unless a secured e-sign is used.
• Digital Signature: Technology-specific; relies on encryption and decryption using a private key (known to the signer) and a public key (shared for verification). Any change in the signed document renders the signature invalid.

Security Standards

• Electronic Signature: Offers basic authentication and proof of consent but can be more vulnerable to tampering, especially in unsecured forms like scanned signatures or email footers.
• Digital Signature: Highly secure, tamper-evident, and difficult to forge. Provides integrity, authenticity, and non-repudiation.

Certification & Validation

• Electronic Signature: May not always require validation from a licensed authority, depending on the method used. OTP-based e-signs under Aadhaar framework are validated through government-approved service providers.
• Digital Signature: Must be issued by a licensed Certifying Authority (CA) in India (e.g., eMudhra, Sify, (n)Code Solutions) authorised by the Controller of Certifying Authorities.

Legal Recognition & Usage

• Electronic Signature: Legally recognised under the IT Act but has lower evidentiary value compared to digital signatures. Suitable for low- to medium-risk transactions like HR documents or basic agreements.
• Digital Signature: Enjoys stronger legal recognition and is mandatory for certain filings such as MCA e-forms, GST returns, income tax filings, and government tenders.

Validity Period

• Electronic Signature: No standard validity period unless linked to a secured e-sign platform.
• Digital Signature: Valid up to a maximum of three years, after which renewal from the CA is required.

Conclusion

Both electronic signatures and digital signatures are important tools in modern documentation and transactions. However:

• Electronic signatures are suitable for low-risk, informal, or internal approvals.
• Digital signatures are essential for high-security, high-value, and legally sensitive transactions.

In India, the Information Technology Act, 2000 gives legal recognition to both, but digital signatures enjoy greater trust and evidentiary value.

For anyone involved in business, government filings, or legal work, understanding this difference is essential to ensure compliance, security, and reliability in the digital space.