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 technically and legally distinct realities. Confusing the two can have serious consequences on the evidentiary value of your documents, the regulatory compliance of your organisation and the 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 Concepts Not to Be Confused

Electronic Signature: A Broad Legal Concept

Electronic signature is primarily 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 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 agree", a scanned image of a handwritten signature, an OTP code received by SMS or even an advanced cryptographic signature.

The eIDAS regulation distinguishes three levels of electronic signature:

• Simple Electronic Signature (SES): minimum level, absence of strong technical requirement.
• Advanced Electronic Signature (AES): uniquely linked to the signatory, capable of identifying its author, created with data under its 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 Trust List.

In France, the Civil Code in articles 1366 and 1367 establishes the legal value of 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

Digital signature (digital signature in English) designates, on its part, 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, 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).

During signature, 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 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 concepts as if they were in competition. In reality, digital signature is a particular form of electronic signature — the technically most robust form. Any 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 a digital signature

This point is crucial: a qualified electronic signature under eIDAS must be based 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 service providers speak of "digital signature" to designate solutions that rely only 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-technicians.

To go further on compliance levels, consult our comprehensive guide to electronic signature and the comparison of electronic signature solutions available on the European market.

---

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 | | Required Certificate | No | Yes (qualified or advanced) | | Evidentiary Value | Limited to strong depending on level | Maximum (legal presumption QES) | | Technical Standard | — | ETSI EN 319 132 (XAdES), PAdES | | Possible Revocation | No | Yes (CRL, OCSP) | | Qualified Timestamp | Optional | Recommended / mandatory QES |

What Digital Signature Adds More

Digital signature provides 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 signing is immediately detectable.
• Non-repudiation: the signatory cannot deny having signed, as long as their private key is under their exclusive control.
• Timestamp: combined with a qualified timestamp service (TSA), it fixes the signature date incontestably.

These properties make digital signature the indispensable foundation of qualified electronic signature, the only level with a 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 Organisation in 2026?

Analysis According to Types 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, receipts, non-sensitive HR forms. Low risk, sufficient evidentiary value in a common litigation context.
• Advanced signature: commercial contracts, NDAs, service provision agreements, commercial leases. Recommended level for the majority of B2B uses according to ANSSI and ENISA guidance.
• Qualified signature (PKI digital): notarial acts, public procurement above European thresholds (directive 2014/24/EU), dematerialised 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 regulation 2024/1183, published in OJEU on 30 April 2024) introduces the European Digital Identity Wallet (EUDI Wallet), whose deployment is scheduled for 2026. This wallet will allow European citizens and professionals to use qualified identification means to sign electronically, significantly strengthening the accessibility of qualified signature based on cryptography. Organisations 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 organisation sizes.

---

Criteria for Selecting 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 service provider eIDAS-qualified? Check its presence on the European Trust List (accessible via the European Commission).
2. Which signature formats are supported? PAdES (PDF), XAdES (XML), CAdES (CMS) — the three formats standardised 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 timestamp integrated? Essential for long-term preservation (LTV – Long Term Validation).
5. Does the solution support multi-signatory workflows with delegation, signature order and evidentiary archiving?

Interoperability and Long-Term Archiving

An often-neglected aspect is the sustainability of evidentiary 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 eIDAS-compliant evidentiary archiving. Compare the 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

Foundational European Texts

The regulatory foundation of 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 1 July 2016. Its article 25 states the cardinal principle: "A qualified electronic signature has legal effect equivalent to that of a handwritten signature." Articles 26 to 32 define the technical requirements of advanced and qualified levels.

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

French Law

Under domestic law, articles 1366 and 1367 of the Civil Code (from ordinance no. 2016-131 of 10 February 2016) establish the legal value of electronic signature. Article 1367 specifies 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 under 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: procedures for generation and validation
• 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 notably guarantee data minimisation collected during identification processes (art. 5), implement appropriate security measures (art. 32) and, if applicable, conduct an impact assessment (DPIA) under art. 35 for high-risk processing.

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 simple electronic signature for an act requiring qualified signature exposes the organisation 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), administrative sanctions that can reach several million euros.

Usage Scenarios: Digital and Electronic Signature in Practice

Scenario 1 — A Business Law Firm of 15 Collaborators

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

By deploying an advanced electronic signature solution (AES) for routine 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 sectoral benchmarks published by the National Bar Council (2024), firms that have dematerialised their signature processes observe a reduction of 60 to 75% in contractualisation delays and savings of 8 to 12 € per act (postal fees, printing, paper archiving). The audit trail integrated into the platform also strengthened evidentiary security during litigation, signature metadata (IP, qualified timestamp, certified identity) having been produced as admissible evidence.

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

A mid-sized 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 the high contractual volume made manual management particularly costly and risky.

By adopting an eIDAS-compliant advanced electronic signature platform — recognised throughout Member States through the mutual recognition principle of article 25 eIDAS — the company was able to unify its contractualisation 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-sized industrial companies using advanced or qualified electronic signature reduce their contractual management costs by 40 to 55% and divide by three the risk of litigation related to signature contestations.

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, Health Code). A mid-sized hospital group had to secure the signature of several dozen sensitive acts per week, while guaranteeing traceability required by health authorities.

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

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

Conclusion

The difference between digital signature and electronic signature is not just a matter of terminology: it determines the legal value of your acts, the technical robustness of your processes and your organisation's regulatory compliance facing eIDAS 2.0, GDPR and NIS2 requirements. Digital signature, based 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 organisation for the arrival of EUDI Wallet in 2026, Certyneo puts at your disposal a B2B-compliant eIDAS platform, integrating advanced and qualified signature, certified timestamp and evidentiary archiving. Start free on Certyneo or consult our pricing to find the formula adapted to your volume of acts.