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 probative value of your documents, your organisation'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, 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.

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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 the European regulation eIDAS (No. 910/2014) in 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 intentionally 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 even 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): uniquely linked to the signatory, capable of identifying the author, created with data under their exclusive control, and 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 procedure guaranteeing its connection with the act to which it is attached".

Digital signature: a precise technological concept

Digital signature (digital signature in English) designates, on the other hand, 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).

When 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 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.

The technical standards governing digital signature include in particular:

• PKCS#7 / CMS (Cryptographic Message Syntax)
• XAdES, CAdES, PAdES (signature formats defined by ETSI, in particular 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 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 + timestamping) > └── Qualified electronic signature ↔ always based on a digital signature PKI

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 to say, 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. Vendor marketing: many service providers 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 to non-technical users.

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

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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 | | 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 timestamping | Optional | Recommended / mandatory QES |

What digital signature adds in addition

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 of the document after signing is immediately detectable.
• Non-repudiation: the signatory cannot deny having signed, provided their private key is under their exclusive control.
• Timestamping: combined with a qualified timestamping service (TSA), it sets the date of signature incontestably.

These properties make digital signature the essential foundation of qualified electronic signature, the only level enjoying 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.

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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 sector requirements:

• Simple signature: quotes, internal purchase orders, acknowledgements of receipt, non-sensitive HR forms. Low risk, sufficient probative value in a typical dispute context.
• Advanced signature: commercial contracts, NDAs, service agreements, commercial leases. Recommended level for the majority of B2B uses according to ANSSI and ENISA guidelines.
• Qualified signature (digital PKI): notarial acts, public procurement above European thresholds (Directive 2014/24/EU), digitalised 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 Official Journal on 30 April 2024) introduces the European Digital Identity Wallet (EUDI Wallet), with deployment planned 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. 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 organisation 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 service provider eIDAS-qualified? 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 standardised by ETSI.
3. Is private key storage compliant with QSCD? (e.g.: HSM certified Common Criteria EAL 4+ or FIPS 140-2 Level 3)
4. Is qualified timestamping integrated? Essential for long-term retention (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 durability of probative value. A digital signature is based 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 in 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 ROI calculator for electronic signature.

Legal framework applicable to electronic and digital signature

Founding European texts

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

The eIDAS 2.0 regulation (EU 2024/1183) modernises 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 service providers.

French law

In 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 in the use of a reliable identification procedure guaranteeing its connection 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 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

Managing cryptographic keys and digital certificates involves processing identity data, subject to GDPR No. 2016/679. Data controllers must in particular guarantee the minimisation of data collected during identification processes (Article 5), implement appropriate security measures (Article 32) and, where applicable, conduct an impact assessment (DPIA) according to Article 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 security of software supply chains.

Legal risks in case of non-compliance

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

Usage scenarios: digital and electronic signature in practice

Scenario 1 — A 15-lawyer business law firm

A firm specialising in contract law and mergers and acquisitions handled on average 300 acts per month, including share sale documents, representations and warranties agreements (R&W) and transaction protocols. Historically, each act required postal dispatch or a physical signing meeting, 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 digital PKI signature) for high-stakes acts, the firm reduced its average signing delay to less than 4 hours. According to benchmarks published by the French 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 (postage, printing, paper archiving). The audit trail integrated into the platform also strengthened probative security during a dispute, with signature metadata (IP, qualified timestamp, certified identity) being produced as admissible evidence.

Scenario 2 — A mid-size manufacturing company managing 400 supplier contracts per year

A mid-size enterprise in the manufacturing sector, 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 contract volume made manual management particularly costly and risky.

By adopting an advanced electronic signature platform compliant with eIDAS — recognised throughout the Member States thanks to the mutual recognition principle of Article 25 eIDAS — the company was able to unify its contractualisation process. The use of asymmetric cryptography (digital signature) for strategic contracts guaranteed document integrity across the entire lifecycle. Sector studies (IDC European Trust Services report, 2025) indicate that mid-size industrial enterprises using advanced or qualified electronic signature reduce their contract management costs by 40 to 55% and divide by three the risk of dispute related to signature contestations.

Scenario 3 — A hospital group of approximately 600 beds

In the healthcare sector, the signing 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 had 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 an eIDAS-qualified TSP, and by integrating LTV-PAdES probative archiving, the facility met the audit requirements of the HAS (French National Health Authority) and the ANSM (National Medicines Safety Agency). According to feedback published by DSIH (Healthcare IT Decision, 2024), healthcare facilities that have deployed qualified electronic signature observe an 80% reduction in contractualisation delays with their industrial partners and strengthened 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 engages the legal value of your acts, the technical robustness of your processes and your organisation's regulatory compliance in the face of 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 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 the EUDI Wallet in 2026, Certyneo puts at your disposal a B2B platform compliant with eIDAS, integrating advanced and qualified signature, certified timestamping and probative archiving. Get started free on Certyneo or consult our pricing to find the formula adapted to your volume of acts.