Electronic Signature vs. Digital Signature
“Electronic signature” and “digital signature” are often used interchangeably, but they are not the same thing. Understanding the difference is important for choosing the right level of security and legal protection for your documents, especially in the Philippine legal context.
The short version: All digital signatures are electronic signatures, but not all electronic signatures are digital signatures. A digital signature is a specific, more secure type of electronic signature that uses cryptography.
Definitions
Electronic Signature
An electronic signature is any electronic mark, symbol, sound, or process used to indicate consent or approval in digital form. Under RA 8792, it is defined as “any distinctive mark, characteristic and/or sound in electronic form, representing the identity of a person and attached to or logically associated with the electronic data message or electronic document.”
Examples:
- Typing your name at the end of a document
- Clicking “I Agree” on a digital form
- Drawing your signature with a stylus
- Uploading an image of your handwritten signature
- Voice authorization
Digital Signature
A digital signature is a specific type of electronic signature that uses Public Key Infrastructure (PKI) and cryptographic algorithms. It creates a mathematically verifiable link between the signer’s identity and the document, ensuring that the signature is authentic and the document has not been tampered with.
How it works:
- A cryptographic hash of the document is generated
- The hash is encrypted with the signer’s private key
- The encrypted hash (the digital signature) is attached to the document
- Anyone can verify the signature using the signer’s public key
Head-to-Head Comparison
| Feature | Electronic Signature | Digital Signature |
|---|---|---|
| Definition | Any electronic mark showing consent | Cryptographically secured signature |
| Technology | Varies (can be very simple) | PKI and encryption |
| Identity verification | Varies (from none to moderate) | Certificate-based (strong) |
| Tamper detection | Not inherent | Built-in (hash comparison) |
| Non-repudiation | Weak | Strong (cryptographic proof) |
| Legal validity (PH) | Valid under RA 8792 | Valid with stronger presumption |
| Evidentiary weight | Depends on implementation | Stronger under Rules on Electronic Evidence |
| Complexity | Simple to implement | Requires PKI infrastructure |
| Cost | Low to none | Higher (certificate costs) |
| Speed | Fast | Slightly more steps |
| Reversibility | Depends | Mathematically non-repudiable |
Security Deep Dive
Authentication (Who signed?)
- Electronic signature: Authentication depends on the implementation. A typed name provides weak authentication; a biometric signature provides stronger authentication. There is no inherent mechanism to prove identity.
- Digital signature: Authentication is provided by the digital certificate, which is issued by a Certificate Authority (CA) after verifying the signer’s identity. The certificate binds the signer’s identity to their public key.
Integrity (Has the document been altered?)
- Electronic signature: No inherent integrity check. A document could be modified after an e-signature is applied, and there may be no way to detect the change.
- Digital signature: Any modification to the document after signing breaks the cryptographic hash. Verification instantly reveals tampering.
Non-Repudiation (Can the signer deny signing?)
- Electronic signature: The signer may be able to deny signing, depending on the strength of the authentication method.
- Digital signature: Non-repudiation is strong because only the signer’s private key could have created the signature. Unless the signer can prove their private key was compromised, they cannot deny the signature.
For more on how cryptography prevents fraud, see how advanced cryptographic technology helps prevent document fraud.
Legal Standing in the Philippines
Both types are legally valid under RA 8792, but with different presumptions:
| Legal Aspect | Electronic Signature | Digital Signature |
|---|---|---|
| Legal validity | Yes (Section 8, RA 8792) | Yes (Section 8, RA 8792) |
| Presumption of authenticity | Basic | Stronger (PKI-backed) |
| Court admissibility | Yes (with authentication) | Yes (with stronger presumption) |
| E-notarization use | Permitted | Preferred (more secure) |
| Regulatory acceptance | Broad | Broad, with advantages in regulated industries |
Under the Rules on Electronic Evidence, a digital signature from an accredited CA creates a presumption that the signature is authentic and the document is reliable – shifting the burden of proof to the party challenging the signature.
When to Use Each
Use an Electronic Signature when:
- The document is low-risk (internal approvals, routine agreements)
- Speed and convenience are the primary concerns
- All parties are comfortable with a simpler authentication method
- The legal stakes are moderate and the relationship is trusted
- Examples: HR onboarding documents, internal sign-offs, NDAs, standard purchase orders
Use a Digital Signature when:
- The document is high-stakes (major contracts, financial agreements, litigation documents)
- Maximum security and non-repudiation are needed
- The document may need to be presented in court
- Regulatory requirements mandate strong authentication (banking, government, notarization)
- The document will be e-notarized
- Examples: Board resolutions, secretary’s certificates, notarized contracts, financial instruments, court filings
For guidance on making signatures court-ready, see how to make your digital signatures court-ready in the Philippines.
Can You Use Both?
Yes. Many organizations use electronic signatures for routine documents and digital signatures for high-security documents. The key is matching the signature type to the risk level of the document:
| Risk Level | Document Type | Recommended Signature |
|---|---|---|
| Low | Internal memos, routine approvals | Electronic signature |
| Medium | Standard contracts, vendor agreements | Electronic signature (with audit trail) |
| High | Financial agreements, regulated filings | Digital signature |
| Critical | Notarized documents, court filings | Digital signature |
Related Pages
- Glossary: Electronic Signature
- Glossary: Digital Signature
- Glossary: Public Key Infrastructure (PKI)
- E-Signature vs. Wet Ink Signature
- E-Notarization vs. Physical Notarization
NotarialOS supports both electronic and digital signatures, letting you choose the right level of security for every document – with PKI-backed digital signatures for e-notarization and high-security workflows.