Difference Between Digital Signature and Electronic Signature in 2026

Introduction

In daily professional exchanges, the terms "electronic signature" and "digital signature" are often used interchangeably. Yet, they designate realities that are technically and legally distinct. Confusing the two can have serious consequences on the probative value of your documents, regulatory compliance of your organization, and security of your contractual exchanges. This article decrypts, in an expert and factual manner, the difference between digital signature and electronic signature, based on the eIDAS 2.0 framework, ETSI standards, and European B2B practice. You will know exactly which solution to choose according to your situation in 2026.

---

Fundamental Definitions: Two Notions Not to Confuse

Electronic Signature: A Broad Legal Concept

The electronic signature is above all a legal concept, defined by the European regulation eIDAS (No. 910/2014) in its article 3, point 10, as "data in electronic form which are attached to or logically associated with other data in electronic form and which the signatory uses to sign". This deliberately broad definition encompasses a multitude of processes: a simple click on "I accept", a scanned image of a handwritten signature, an OTP code received by SMS, or an advanced cryptographic signature.

The eIDAS regulation distinguishes three levels of electronic signature:

• Simple electronic signature (SES): minimal level, absence of strong technical requirement.
• Advanced electronic signature (AES): linked unequivocally to the signatory, capable of identifying the author, created with data under their exclusive control, and detecting any subsequent modification of the document.
• Qualified electronic signature (QES): the highest level, based on a qualified certificate issued by a trust service provider (TSP) listed on the European Trust List.

In France, the Civil Code in articles 1366 and 1367 consecrates the legal value of the electronic signature, provided that it "consists of the use of a reliable identification process guaranteeing its link with the act to which it is attached".

Digital Signature: A Precise Technological Concept

The digital signature (digital signature in English) designates, for its part, a specific cryptographic mechanism. It relies on the principle of asymmetric cryptography, also called public key cryptography (PKI – Public Key Infrastructure). Concretely, the signatory has a pair of keys:

• A private key, secret, preserved in a secure device (smart card, HSM token or cloud HSM).
• A public key, shareable, associated with a digital certificate issued by an accredited Certification Authority (CA).

When signing, a hash algorithm (typically SHA-256 or SHA-3) generates a unique fingerprint of the document. This fingerprint is then encrypted with the signatory's private key: this is the digital signature proper. Any recipient can verify this signature by decrypting the fingerprint with the public key and comparing it to a recalculated fingerprint of the received document. If the two fingerprints match, the integrity and authenticity of the document are mathematically proven.

Technical standards governing digital signature include notably:

• PKCS#7 / CMS (Cryptographic Message Syntax)
• XAdES, CAdES, PAdES (signature formats defined by ETSI, notably ETSI EN 319 132 for XAdES)
• RSA-2048, ECDSA P-256 as common algorithms

---

The Relationship Between the Two Concepts: An Inclusion, Not an Opposition

Digital Signature is a Subset of Electronic Signature

A frequent error is to oppose the two notions as if they were in competition. In reality, digital signature is a particular form of electronic signature — the most technically robust form. Every digital signature is an electronic signature, but the reverse is not true.

The following diagram illustrates this inclusion:

> Electronic signature (broad legal concept) > └── Simple electronic signature (e.g.: checkbox, scanned image) > └── Advanced electronic signature (e.g.: OTP + time-stamping) > └── Qualified electronic signature ↔ always based on a digital signature

This point is crucial: a qualified electronic signature within the meaning of eIDAS must rely on a qualified signature creation device (QSCD) and a qualified certificate — in other words, it necessarily relies on asymmetric cryptography, that is, on a digital signature.

Why Is This Confusion So Widespread?

Several factors fuel the confusion:

1. Approximate translation: In English, digital signature and electronic signature are two distinct terms, but in French, "numérique" and "électronique" are often used as synonyms in everyday language.
2. Editor marketing: Many vendors speak of "digital signature" to designate solutions that only rely on a simple or advanced level, creating commercial ambiguity.
3. Technological evolution: Modern user interfaces mask the underlying cryptographic complexity, making the distinction less visible for non-technical users.

To learn more about compliance levels, consult our comprehensive electronic signature guide and the comparison of electronic signature solutions available on the European market.

---

Technical and Legal Comparison: Summary Table

Differentiation Criteria

| Criteria | Electronic Signature (simple) | Digital Signature / QES | |---|---|---| | Basis | Legal (eIDAS, Civil Code) | Cryptographic (PKI, X.509) | | Technology | Variable (OTP, image, click) | Asymmetric cryptography | | Required Certificate | No | Yes (qualified or advanced) | | Probative Value | Limited to strong depending on level | Maximum (legal presumption QES) | | Technical Standard | — | ETSI EN 319 132 (XAdES), PAdES | | Revocation Possible | No | Yes (CRL, OCSP) | | Qualified Time-stamping | Optional | Recommended / mandatory QES |

What Digital Signature Adds Beyond

Digital signature provides four guarantees that simple electronic signature cannot offer:

• Authenticity: mathematical proof of the signatory's identity via their certificate.
• Integrity: any modification of the document after signature is immediately detectable.
• Non-repudiation: the signatory cannot deny having signed, as long as their private key is under their exclusive control.
• Time-stamping: combined with a qualified time-stamping service (TSA), it establishes the signing date incontestably.

These properties make digital signature the incontrovertible foundation of qualified electronic signature, the only level with legal presumption of reliability in all EU Member States according to article 25 of eIDAS regulation.

To understand in detail the eIDAS 2.0 regulatory framework that came into force in 2024, consult our dedicated guide to eIDAS 2.0 regulation.

---

Which Level to Choose for Your Organization in 2026?

Analysis According to Act Types

The choice between simple, advanced, or qualified electronic signature (based on digital signature) depends directly on the legal nature of the act, the associated risk, and sectorial requirements:

• Simple signature: quotations, internal purchase orders, acknowledgments of receipt, non-sensitive HR forms. Low risk, sufficient probative value in a common litigation context.
• Advanced signature: commercial contracts, NDAs, service agreements, commercial leases. Recommended level for the majority of B2B uses according to ANSSI and ENISA guidance.
• Qualified signature (PKI digital): notarial acts, public contracts above European thresholds (directive 2014/24/EU), digitalized civil status acts, certain regulated banking acts. Mandatory in several regulated sectors.

The Impact of eIDAS 2.0 Reform on Practices

The eIDAS 2.0 regulation (EU Regulation 2024/1183, published in the OJEU on 30 April 2024) introduces the European Digital Identity Wallet (EUDI Wallet), whose deployment is planned for 2026. This wallet will allow European citizens and professionals to use qualified identification means to sign electronically, considerably strengthening the accessibility of qualified signature based on cryptography. Companies that adopt PKI-compatible solutions now will prepare their infrastructure for this evolution.

Our electronic signature in business page details deployment strategies adapted to different organization sizes.

---

Selection Criteria for a Signature Solution in 2026

Technical Questions to Ask Your Service Provider

When evaluating a signature platform, IT and legal teams should verify the following points:

1. Is the service provider qualified eIDAS? Check their presence on the European Trusted List (accessible via the European Commission).
2. Which signature formats are supported? PAdES (PDF), XAdES (XML), CAdES (CMS) — the three formats standardized by ETSI.
3. Is private key storage QSCD compliant? (e.g.: HSM certified Common Criteria EAL 4+ or FIPS 140-2 Level 3)
4. Is qualified time-stamping integrated? Essential for long-term preservation (LTV – Long Term Validation).
5. Does the solution support multi-signatory workflows with delegation, signature order, and evidential archiving?

Interoperability and Long-Term Archiving

An often neglected aspect is the durability of probative value. A digital signature relies on cryptographic algorithms that evolve: SHA-1 has been obsolete since 2017, RSA-1024 since 2015. A serious solution must implement long-term validation (LTV) according to ETSI EN 319 102-1, which consists of embedding validation evidence (revocation status, certificate chain, time-stamping) directly into the signed file at the time of signature, guaranteeing its verifiability in 10, 20 or 30 years.

Certyneo natively integrates LTV-PAdES formats and evidential archiving compliant with eIDAS. Compare available features on our pricing page or estimate your return on investment with the electronic signature ROI calculator.

Applicable Legal Framework for Electronic and Digital Signature

European Founding Texts

The regulatory foundation of electronic signature in Europe relies mainly on the eIDAS regulation No. 910/2014 (Electronic Identification, Authentication and Trust Services), directly applicable in the 27 Member States since 1 July 2016. Its article 25 establishes the cardinal principle: "A qualified electronic signature shall have an equivalent legal effect to a handwritten signature." Articles 26 to 32 define the technical requirements for advanced and qualified levels.

The eIDAS 2.0 regulation (EU 2024/1183) modernizes this framework by introducing the European digital identity wallet (EUDI Wallet), by expanding the scope of qualified trust services and by strengthening cybersecurity requirements for TSP providers.

French Law

In domestic law, articles 1366 and 1367 of the Civil Code (arising from ordinance No. 2016-131 of 10 February 2016) consecrate the legal value of electronic signature. Article 1367 clarifies that it "consists of the use of a reliable identification process guaranteeing its link with the act to which it is attached". The presumption of reliability benefits qualified electronic signatures within the meaning of eIDAS according to decree No. 2017-1416 of 28 September 2017.

ETSI Technical Standards

Technical implementation is governed by the standards of the European Telecommunications Standards Institute (ETSI):

• ETSI EN 319 132-1: XAdES format for XML documents
• ETSI EN 319 122-1: CAdES format for binary data
• ETSI EN 319 162-1: PAdES format for PDF documents
• ETSI EN 319 102-1: generation and validation procedures
• ETSI EN 319 401: general requirements for TSPs

Cybersecurity and Data Protection

The management of cryptographic keys and digital certificates involves the processing of identity data, subject to GDPR No. 2016/679. Data controllers must in particular guarantee the minimization of data collected during identification processes (art. 5), implement appropriate security measures (art. 32), and, where applicable, conduct an impact assessment (DPIA) according to art. 35 for high-risk processing.

The NIS2 directive (EU 2022/2555), transposed into French law by law No. 2024-449 of 21 May 2024, imposes strengthened cybersecurity obligations on essential and important entities, including qualified trust service providers. These obligations cover risk management, incident notification, and software supply chain security.

Legal Risks in Case of Non-Compliance

Using a simple electronic signature for an act requiring a qualified signature exposes the organization to several risks: nullity of the act, inadmissibility of evidence in litigation, engagement of the service provider's contractual liability, and, in certain regulated sectors (health, finance, public procurement), to administrative sanctions that can reach several million euros.

Use Scenarios: Digital and Electronic Signature in Practice

Scenario 1 — A 15-Member Business Law Firm

A firm specialized in contract law and mergers-acquisitions processed an average of 300 acts per month, including share transfer acts, representations and warranties agreements (W&C), and settlement protocols. Historically, each act required postal sending or a physical meeting for signature, generating an average delay of 5 to 8 working days per file.

By deploying an advanced electronic signature solution (AES) for common commercial contracts and a qualified electronic signature (QES, based on a PKI digital signature) for high-stakes acts, the firm reduced its average signature delay to less than 4 hours. According to sectoral benchmarks published by the National Bar Council (2024), firms that have digitalized their signature processes observe a 60 to 75% reduction in contractualization delays and savings of 8 to 12 € per act (postal fees, printing, paper archiving). The audit trail integrated into the platform also strengthened probative security during litigation, with signature metadata (IP, qualified time-stamp, certified identity) having been produced as admissible evidence.

Scenario 2 — A Mid-Size Industrial Company Managing 400 Supplier Contracts Per Year

A mid-size manufacturing company with sites spread across four European countries had to have framework contracts and amendments signed by suppliers based in Germany, Poland, and Spain. The diversity of national laws and high contractual volume made manual management particularly costly and risky.

By adopting a eIDAS-compliant advanced electronic signature platform — recognized across all Member States thanks to the mutual recognition principle of article 25 eIDAS — the company was able to unify its contractualization process. Recourse to asymmetric cryptography (digital signature) for strategic contracts guaranteed document integrity throughout the lifecycle. Sectoral studies (IDC European Trust Services report, 2025) indicate that mid-size industrial companies using advanced or qualified electronic signature reduce their contract management costs by 40 to 55% and divide by three the risk of litigation related to signature disputes.

Scenario 3 — A Hospital Group of About 600 Beds

In the health sector, the signature of clinical research protocols, agreements with pharmaceutical laboratories, and work contracts with hospital practitioners involves strict regulatory requirements (HDS, GDPR, Public Health Code). A mid-size hospital group had to secure the signing of several dozen sensitive acts per week, while guaranteeing the traceability required by health authorities.

By deploying a qualified electronic signature based on certificates issued by a qualified eIDAS TSP, and by integrating LTV-PAdES evidential archiving, the establishment met the audit requirements of the HAS (French High Health Authority) and ANSM. According to feedback published by DSIH (Healthcare IT Decision, 2024), health establishments that deployed qualified electronic signature observe an 80% reduction in contractualization delays with their industrial partners and strengthened documentary compliance during regulatory inspections.

For healthcare professionals, Certyneo offers a dedicated solution: discover our electronic signature offering in healthcare.

Conclusion

The difference between digital signature and electronic signature is not merely a matter of terminology: it engages the legal value of your acts, the technical robustness of your processes, and regulatory compliance of your organization facing eIDAS 2.0, GDPR, and NIS2 requirements. Digital signature, founded on asymmetric cryptography and ETSI standards, constitutes the technological foundation of qualified electronic signature — the only level benefiting from a legal presumption of reliability throughout the European Union.

To choose the level adapted to your acts, secure your contractual flows, and prepare your organization for the arrival of the EUDI Wallet in 2026, Certyneo puts at your disposal a B2B platform compliant with eIDAS, integrating advanced and qualified signature, certified time-stamping, and evidential archiving. Start free on Certyneo or consult our pricing to find the plan adapted to your act volume.