Electronic Transactions, Electronic Signatures, and Legal Challenges in the Digital Era

This document is prepared as an academic legal paper with the objective of explaining and analyzing the legal framework governing electronic transactions, electronic signatures, and digital signatures under Thai law, with particular emphasis on structural legal principles alongside issues encountered in actual practice.

The analysis presented herein is not intended merely to set out the law in theoretical terms. Rather, it places significant importance on issues concerning manifestation of intent, legal enforceability, and the burden of proof in judicial proceedings, all of which are matters currently faced by business operators and legal practitioners.

Introduction

The transition from a paper-based society to a digital society has significantly affected the structure of private law and commercial law, particularly in matters concerning the manifestation of intent and the legal binding effect of contractual parties. Many transactions today are no longer concluded face-to-face, but are instead conducted through electronic systems such as online platforms, email systems, or dedicated applications.

The law governing electronic transactions therefore plays a crucial role in supporting such forms of transactions, with its principal objective being to create legal equivalence between electronic documents and documents in traditional form. However, although the law has attempted to adapt to technological developments, both structural and practical issues continue to arise.

Thailand’s Legal Framework on Electronic Transactions

2.1 Principles and Rationale Behind the Enactment of the Electronic Transactions Act

The enactment of the Electronic Transactions Act B.E. 2544 (2001) was grounded in the structural transformation of communication methods and transactional practices in society, which increasingly came to rely on electronic technology as a primary mechanism due to its convenience, speed, and efficiency compared with traditional methods.

Nevertheless, electronic transactions differ significantly from transactions already recognized under existing law, particularly in relation to the form of documents, the affixing of signatures, and the use of evidence, all of which were originally tied to paper-based documents. Such differences created uncertainty as to the legal status of electronic data and became an obstacle to confidence in electronic transactions.

This Act therefore has the important objective of recognizing the legal status of electronic data as equivalent to written documents or written evidence, certifying methods of sending and receiving electronic data, recognizing the use of electronic signatures, and allowing the admissibility of evidence in the form of electronic data, so as to promote the reliability and legal enforceability of such transactions on an equal footing with conventional transactions.

In addition, the law seeks to establish an institutional mechanism by creating the Electronic Transactions Commission, which is empowered to formulate policy, prescribe rules, supervise implementation, and monitor technological developments in accordance with international standards. This serves to support electronic transactions both domestically and internationally.

2.2 Scope of Application of the Act

The Act applies to civil and commercial transactions conducted using electronic data, except where a Royal Decree provides that all or part of the law shall not apply.

The law also extends to electronic transactions undertaken by the public sector, such as applications, approvals, registrations, administrative orders, payments, or other legal acts, where such actions are carried out in the form of electronic data in accordance with the prescribed rules. Such actions are deemed legally valid in the same manner as those carried out in traditional form (Section 35). This reflects a systematic recognition of digital transactions within the public sector.

2.3 Meaning of Electronic Transactions

An electronic transaction refers to a legal act, business act, civil or commercial transaction, or governmental operation carried out wholly or partly by electronic means. The law seeks to recognize such electronic data as having legal effect equivalent to acts carried out in documentary or traditional form, in accordance with the principle of functional equivalence.

The definition of electronic transactions under Section 4 clearly reflects the concept of functional equivalence. That is, the law does not focus on the medium used, but rather considers whether the electronic method can perform the same function as a written document, a signature, or the retention of an original document.

2.4 Principle of Recognition of Electronic Transactions

The law establishes the important principle that the legal validity, binding effect, and enforceability of a statement shall not be denied solely because it is in the form of electronic data (Section 7). This principle forms the basis for recognizing the following elements of electronic transactions:

Form of document Where the law requires a transaction to be made in writing or supported by written evidence, such requirement shall be deemed satisfied if the information is in the form of electronic data that is accessible and capable of being retrieved for later use without alteration to its material substance (Section 8).

Signature A signature may be made in the form of electronic data, provided that a method is used which can identify the person and indicate that person’s intention to authenticate the message. Such method must be sufficiently reliable as appropriate for the purpose and surrounding circumstances (Section 9).

Original document and retention Where it can be proven that the electronic data is complete, accurate, and unaltered, it shall be deemed an original document under the law (Section 10).

Electronic evidence Electronic data shall not be denied admissibility as evidence solely because of its form. The court will consider its reliability based on the method of its creation, storage, transmission, and the identification of the persons involved (Section 11).

e-Signatures and Digital Signatures as Instruments of Manifestation of Intent

An Electronic Signature (e-Signature) serves as a “symbol of manifestation of intent,” much like a handwritten signature on a paper document. In other words, it functions as a mechanism for confirming that a person intends to bind himself or herself to the statement or agreement contained in the relevant electronic data.

e-Signature is a broad and flexible concept, covering any electronic method used to demonstrate the relationship between a person and data, and to show acceptance of the content or agreement, whether by typing one’s name at the end of an email, clicking an “I accept” button (click-wrap / browse-wrap), or drawing a signature on an electronic device.

The key feature of an e-Signature is that it emphasizes intent rather than the particular form or technology used. If it can be shown that a person intended to bind himself or herself to the content contained in the electronic data, a legal signature may be deemed to exist. However, this flexibility inevitably creates uncertainty, because in practice courts and law enforcement authorities must still assess the reliability of the signing method on a case-by-case basis, taking into account surrounding circumstances, the burden of proof, and other factual elements such as the system used, authentication procedures, and the conduct of the contracting parties.

By contrast, a Digital Signature is a particular type of e-Signature developed specifically to enhance the reliability and security of the manifestation of intent, primarily through the use of encryption technology and Public Key Infrastructure (PKI).

A Digital Signature does not merely identify the signatory. It also serves as a technical mechanism that supports the legal burden of proof by enabling systematic verification of the following:

whether the electronic data has been altered after signature;
whether the signature is uniquely linked to the signatory and cannot be interchangeably used by another person; and
whether the signing process was carried out through a reliable and verifiable method.

Because of these characteristics, a Digital Signature helps reduce ambiguity in proving both the identity of the signatory and the integrity of the data, which are issues that commonly give rise to disputes where more general forms of e-Signature are used.

From a legal perspective, the distinction between e-Signature and Digital Signature is therefore not one of valid versus invalid use, but rather one of the degrees of risk and burden of proof. In other words, an e-Signature may be suitable for ordinary transactions involving relatively low risk or where the surrounding circumstances are sufficiently clear, whereas a Digital Signature is generally preferred for transactions of high value, long-term legal effect, or transactions likely to be scrutinized in dispute resolution or court proceedings.

In summary, both e-Signatures and Digital Signatures function as tools of manifestation of intent, but they differ in terms of their level of security and their ability to support the legal burden of proof. These are critical factors when determining which method is appropriate for each type of transaction.

Legal Limitations

However, the existence of highly secure technology does not mean that legal problems disappear entirely. In practice, disputes often arise not from the technology itself, but from other factors, such as:

the use or control of the system by individuals;
lack of clarity in an organization’s internal processes; and
contractual terms or conditions that are inconsistent with actual patterns of use.

Accordingly, the choice between e-Signature and Digital Signature is not merely a technical decision, but a legal decision that must be considered together with the transaction structure, the level of risk, and the burden of proof in the event of a dispute.

Practical Legal Problems in Electronic Transactions

4.1 Problems of Proving Identity and Intent

One of the most significant issues is the denial of contractual binding effect by a party on grounds that:

he or she did not personally sign;
the system was hacked; or
another person used the account or device.

In cases involving e-Signatures without a robust identity verification system, the burden of proof often falls on the party asserting enforceability, who may face considerable difficulty in litigation.

4.2 Problems Concerning Evidentiary Weight in Judicial Proceedings

Although the law recognizes electronic documents as admissible evidence, in practice the courts continue to focus heavily on the reliability of the process by which the data was created and stored.

If the system lacks time stamps, audit trails, or adequate security measures, such documents may carry less evidentiary weight than expected.

4.3 Problems of Overlap with Other Laws

Electronic transactions do not exist in isolation under the Electronic Transactions Act alone. Rather, they intersect with multiple areas of law, each having different objectives and regulatory criteria. Such overlap is one of the major sources of legal risk in practice.

First, personal data protection law plays a direct role in the use of e-Signatures and Digital Signatures, because these systems often involve the collection, use, and storage of personal data, such as identifying information, biometric data, or authentication data.

If the system is not designed in accordance with personal data protection principles — such as necessity, purpose limitation, or appropriate security safeguards — then even where the transaction is contractually binding, the parties or data controllers may still face liability under personal data protection law.

Second, the law of evidence is another significant overlapping dimension. Although the law recognizes electronic documents and signatures in principle, where a dispute arises the court must still assess the evidentiary weight of such materials by considering the reliability of the process used to create and preserve the data, such as whether audit trails exist, whether data tampering can be detected, and whether the identification of the actor is clear.

If the e-Signature system lacks such mechanisms, the electronic document may carry less weight than the parties had expected.

Third, sector-specific laws may impose additional conditions or formal requirements on electronic transactions. For example:

under labour law, the use of e-Signatures in documents affecting employees’ rights and obligations may require particular attention to voluntariness and the absence of disadvantage;
under financial or banking law, identity verification and security requirements may be especially stringent; and
under company law, the execution by directors or authorized persons may need to comply with applicable articles of association and corporate resolutions.

If an e-Signature system is designed solely with reference to the Electronic Transactions Act, while ignoring the specific requirements of such laws, the transaction may remain enforceable in civil terms but still create liability in other dimensions, whether administrative, criminal, or regulatory.

Thus, the problem of overlap with other laws demonstrates that the design and use of e-Signature systems is not merely a technical matter or a question under a single statute. Rather, it is a structural legal decision that requires consideration of multiple legal dimensions in order to ensure that electronic transactions are secure both in contractual terms and in terms of overall legal liability.

4.4 Transactions That the Law Has Not Yet Fully Accepted in Electronic Form

Although the law tends toward broader acceptance of electronic methods, there remain certain transactions for which the law prescribes specific formalities, such as the making of a will or the registration of certain rights, which cannot yet be fully conducted electronically.

Such uncertainty creates interpretive and enforcement risks.

Conclusion

Electronic transactions and electronic signatures are not merely technological tools. They are important mechanisms that challenge traditional legal concepts of manifestation of intent, legal enforceability, and the proof of facts.

Legal adaptation must therefore proceed alongside a deep understanding of the risks and limitations of technology.

Ultimately, the security and reliability of electronic transactions do not depend solely on the system itself, but on careful legal design that is consistent with the realities of use in a digital society.

Disclaimer

This article is intended solely for the dissemination of legal knowledge in an academic and general informational context and is not prepared for use as legal advice. The information and analysis herein may not cover all issues and may not reflect subsequent amendments to the law or developments in judicial precedents.

Readers should exercise their own judgment and should not rely on this article as a substitute for legal advice from qualified professionals, which must take into account the specific facts and context of each individual case. The publication or use of this article does not constitute the giving of legal advice and does not create any legal relationship between the author and the reader.

Author: Pinprapus Chartikavanich
Date: 20 January 2026