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 denote realities that are technically and legally distinct. Confusing the two can have serious consequences on the probative value of your documents, your organization's regulatory compliance, and the security of your contractual exchanges. This article decrypts, in an expert and factual manner, the difference between digital signature and electronic signature, drawing 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.

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Fundamental Definitions: Two Concepts Not to Be Confused

Electronic Signature: A Broad Legal Concept

Electronic signature is first and foremost a legal concept, defined by European Regulation eIDAS (No. 910/2014) in Article 3, point 10, as "data in electronic form which is attached to or logically associated with other data in electronic form and which is used by the signatory to sign". This deliberately broad definition encompasses a multitude of methods: 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, no strong technical requirement.
• Advanced Electronic Signature (AES): linked unequivocally to the signatory, capable of identifying their identity, created with data under their exclusive control, and capable of detecting any subsequent modification to 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 Trusted List.

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

Digital Signature: A Precise Technological Concept

Digital signature, on the other hand, designates a specific cryptographic mechanism. It is based 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, kept 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).

During signing, a hashing 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 itself. 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

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The Relationship Between the Two Concepts: Inclusion, Not Opposition

Digital Signature is a Subset of Electronic Signature

A frequent error is to oppose the two concepts as if they were in competition. In reality, digital signature is a particular form of electronic signature — the technically most 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 + timestamp) > └── Qualified Electronic Signature ↔ always based on digital signature

This point is crucial: a qualified electronic signature under 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 feed 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 service providers speak of "digital signature" to describe 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 to non-technical users.

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

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Technical and Legal Comparison: Summary Table

Differentiation Criteria

| Criterion | Electronic Signature (simple) | Digital Signature / QES | |---|---|---| | Basis | Legal (eIDAS, Civil Code) | Cryptographic (PKI, X.509) | | Technology | Variable (OTP, image, click) | Asymmetric cryptography | | Certificate Required | 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 Timestamp | Optional | Recommended / mandatory QES |

What Digital Signature Provides Additionally

Digital signature offers four guarantees that simple electronic signature cannot provide:

• Authenticity: mathematical proof of the signatory's identity via their certificate.
• Integrity: any modification to 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.
• Timestamping: combined with a qualified timestamping service (TSA), it fixes the signature date incontestably.

These properties make digital signature the indispensable foundation of qualified electronic signature, the only level enjoying a presumption of reliability in all Member States of the European Union 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.

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Which Level Should You Choose for Your Organization in 2026?

Analysis by Type of Acts

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 sectoral requirements:

• Simple signature: quotations, internal purchase orders, acknowledgments of receipt, non-sensitive HR forms. Low risk, sufficient probative value in a typical 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 deeds, public procurement 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

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

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

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Selection Criteria for a Signature Solution in 2026

Technical Questions to Ask Your Service Provider

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

1. Is the provider eIDAS qualified? Check their presence on the European Trusted List (accessible via the European Commission).
2. What 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 timestamping integrated? Essential for long-term preservation (LTV – Long Term Validation).
5. Does the solution support multi-signatory workflows with delegation, signature order, and probative archiving?

Interoperability and Long-Term Archiving

An often-overlooked aspect is the sustainability 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, timestamp) directly in the signed file at the time of signature, guaranteeing its verifiability in 10, 20, or 30 years.

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

Legal Framework Applicable to Electronic and Digital Signature

Founding European Texts

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

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

Under internal law, Articles 1366 and 1367 of the Civil Code (from Ordinance No. 2016-131 of February 10, 2016) establish the legal value of electronic signature. Article 1367 specifies that it "consists in the use of a reliable identification process guaranteeing its connection with the act to which it is attached". The presumption of reliability benefits electronic signatures qualified under eIDAS according to Decree No. 2017-1416 of September 28, 2017.

ETSI Technical Standards

Technical implementation is governed by standards from 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 processing identity data, subject to GDPR No. 2016/679. Data controllers must notably ensure 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.

NIS2 Directive (EU 2022/2555), transposed into French law by Law No. 2024-449 of May 21, 2024, imposes enhanced 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 simple electronic signature for an act requiring qualified signature exposes the organization to several risks: act nullity, 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 Corporate Law Firm with 15 Collaborators

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

By deploying an advanced electronic signature solution (AES) for common commercial contracts and a qualified electronic signature (QES, based on PKI digital signature) for high-stakes acts, the firm reduced its average signature delay to less than 4 hours. According to sector 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 (postage, printing, paper archiving costs). The integrated audit trail in the platform also strengthened probative security during litigation, with signature metadata (IP, qualified timestamp, certified identity) produced as admissible evidence.

Scenario 2 — A Mid-Market Manufacturing Company Managing 400 Supplier Contracts per Year

A mid-market enterprise in the manufacturing sector, with sites across four European countries, needed to have framework contracts and amendments signed by suppliers based in Germany, Poland, and Spain. The diversity of national legislations and the high contractual volume made manual management particularly costly and risky.

By adopting an eIDAS-compliant advanced electronic signature platform — recognized throughout Member States thanks to the principle of mutual recognition in Article 25 eIDAS — the company was able to unify its contractualization process. The use of asymmetric cryptography (digital signature) for strategic contracts guaranteed document integrity throughout the lifecycle. Sectoral studies (IDC European Trust Services report, 2025) indicate that mid-market industrial companies using advanced or qualified electronic signature reduce contractual management costs by 40 to 55% and reduce litigation risk related to signature disputes by threefold.

Scenario 3 — A Hospital Group of Approximately 600 Beds

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

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

For healthcare professionals, Certyneo offers a dedicated solution: discover our electronic signature offering for 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 your organization's regulatory compliance with 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 enjoying a 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 EUDI Wallet in 2026, Certyneo provides you with a B2B platform compliant with eIDAS, integrating advanced and qualified signature, certified timestamping, and probative archiving. Start free on Certyneo or view our pricing to find the formula adapted to your act volume.