Electronic Contracts and Digital Signatures: Legal Validity, Signature Types, and Risks to Avoid
A partner emails a PDF contract; you print, hand-sign, scan, and return it. Deal done in 10 minutes. But when disputes arise: is that PDF the original? Does the scanned signature prove the partner signed? And does ticking "I agree" on a website equal a signature? The 2023 Law on E-Transactions answers — but not as many assume.
Contents
- 1. Are electronic contracts as valid as paper contracts?
- 2. Four commonly confused concepts
- 3. Digital signatures: the gold standard and when mandatory
- 4. Scanned signatures: why risky
- 5. Clickwrap: does the tick bind?
- 6. Checklist for safe e-contracting
- 7. FAQs
- 8. When to work with a lawyer
1. Are electronic contracts as valid as paper contracts?
Under the 2023 Law on E-Transactions (No. 20/2023/QH15, effective 1/7/2024), data messages have legal value like documents if statutory conditions are met. Electronic contracts — contracts formed as data messages — are valid when meeting the same subject, voluntariness, purpose, and content conditions as ordinary contracts.
The key point: the law does not discriminate between electronic and paper form on validity. But in disputes, the party invoking an e-contract must prove data-message integrity (unaltered) and signer identification — where signature types show very different value.
2. Four commonly confused concepts
| Concept | Nature | Assurance level |
|---|---|---|
| Electronic signature | Broad: any electronic data attached to a data message to identify the signer | Depends on type |
| Digital signature | E-signature using public-key cryptography, tied to a digital certificate | High: integrity + identification |
| Scanned signature | Image of handwritten signature pasted into a file | Low: no cryptographic mechanism |
| Clickwrap | Ticking "I agree" on an electronic interface | Depends on notice and storage process |
Most common confusion: calling a scanned signature a "digital signature." They differ fundamentally in technology and legal value.
3. Digital signatures: the gold standard and when mandatory
Digital signatures use public-key cryptography: the signer signs with a private key; recipients verify with the public key (tied to a digital certificate from a licensed certification authority). This ensures: (1) identification — only the private-key holder could sign; (2) integrity — any post-signing alteration invalidates verification.
In dealings with state authorities (e-tax, e-customs, e-social insurance), digital signatures are usually mandatory. In civil–commercial dealings, parties may agree signature forms freely, but digital signatures carry the highest evidential value in disputes.
4. Scanned signatures: why risky
A scanned handwritten signature pasted into a PDF/Word file is just an image. It cannot answer the questions courts/arbitrators will ask:
- Who pasted this signature image — the signer or someone else?
- Was the file altered after "signing"?
- How to distinguish a genuine signature image from one copied from another document?
In practice, scanned signatures remain widespread for low-value, trusted-counterparty deals. But for important transactions, this is the weakest evidential form of the four — and where authenticity disputes erupt first.
5. Clickwrap: does the tick bind?
Terms of use and online purchase terms accepted by ticking "I agree" (clickwrap) can form binding contracts if: consent is clearly expressed; terms were fully notified with opportunity to read before acceptance; and the system stored the acceptance data message.
Two limits: (1) one-sided adverse terms (mandatory arbitration in remote venues, excessive liability caps, waiver of basic rights) may still face fairness review; (2) for transactions where law requires special form, clickwrap may not suffice.
6. Checklist for safe e-contracting
- Prefer digital signatures for high-value, long-term contracts and new counterparties.
- Agree the signing form upfront in the framework contract/exchange emails — avoid later disputes over "I never agreed to e-signing."
- Preserve integrity: keep original files, system logs, email threads — not just printouts.
- Identify the signer: with new counterparties, verify signing authority (power of attorney, business registration).
- For clickwrap: ensure terms display fully before the accept button, log acceptances, review one-sided terms.
A signing policy for the whole company. Businesses that sign electronically at scale need a written signing policy: which transaction values require digital signatures vs accepted e-signatures; who may sign for the company (with authorization matrices); how signed files and logs are archived (and for how long); and a pre-agreed e-signing clause for framework contracts with recurring counterparties. The policy turns each signing from an ad-hoc risk decision into a routine — which is exactly what courts like to see when authenticity is disputed.
7. FAQs
Q: Are contracts signed via email or PDF legally valid?
A: They can be. Under the 2023 Law on E-Transactions, data messages have the legal value of documents if statutory conditions are met; electronic contracts are valid when meeting the same subject, voluntariness, and content conditions as ordinary contracts. The decisive issue is usually proving data integrity and identifying the signer.
Q: How does a digital signature differ from an electronic signature?
A: A digital signature is a special e-signature using public-key cryptography, tied to a digital certificate issued by a licensed certification authority. Electronic signature is broader: any electronic data attached to a data message to identify the signer — from digital signatures and OTP codes to touchscreen handwriting.
Q: Is a scanned handwritten signature pasted into a contract valid?
A: A scanned signature is just an image, without cryptographic integrity and identification like a digital signature. Its evidential value is much weaker and easily disputed (who pasted it, when, was the file altered). For important deals, use digital signatures or e-signatures with clear authentication.
Q: Does ticking "I agree" (clickwrap) create a binding contract?
A: It can, if e-contract conditions are met: clear expression of will, terms fully notified before acceptance, and the system stored the acceptance data message. But one-sided adverse terms (mandatory arbitration, excessive liability caps) may still be reviewed.
8. When to work with a lawyer
Work with a lawyer when: designing corporate e-contracting processes (signature policy, storage, identification); disputes arise over e-contract/signature authenticity; or clickwrap terms and platform terms of use need review. FLAT Law Firm advises on e-transactions and technology law — hotline 0988424851.
References
- 2023 Law on E-Transactions (No. 20/2023/QH15), effective 1/7/2024.
- Cross-checked via thuvienphapluat.vn as of drafting (28/9/2026).
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