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What are the risks associated with traditional electronic signatures?
With traditional e-signature solutions, documents are transferred to external servers for processing – often without the signatories’ explicit knowledge. This means that third parties gain access to contract content, metadata and personal information. This runs counter to GDPR principles such as data minimisation and purpose limitation.
The alternative: Privacy-first signatures based on the Zero Document Knowledge (ZDK) principle process documents exclusively locally or in encrypted form – the provider never sees the document content. This enables legally compliant signatures without compromising data privacy.
Electronic signatures are now an integral part of digital processes in many organisations. Contracts, approvals and formal confirmations are increasingly being processed digitally, as this reduces throughput times and improves the scalability of workflows.
When it comes to implementation, this is often very specific: some processes require you to obtain a digital signature in order to quickly involve external parties. In these cases, a final document is already available for signing. It is then a matter of integrating a digital signature in a PDF neatly into the approval and signature process.
In both situations, however, a common mistake arises: many decisions in favour of a solution are initially based on convenience, interface or integration effort. However, the question of the security model behind the signature solution often arises too late. This is because with many standard solutions, documents are processed on the server side or are at least temporarily stored in environments to which providers could have technical access. This is precisely where a new architectural approach comes in: so-called privacy-first signature platforms do not attempt to limit the risk organisationally, but rather to eliminate it technically by keeping document content encrypted throughout the entire process.
Why “potential provider access” is a structural risk in sensitive environments
In regulated contexts – such as the public sector, the financial sector, healthcare or legal – the signature is not just a process step, but part of compliance, auditability and risk management. The decisive factor here is not the assumption that a provider “reads” content, but the architectural question of whether content could be available in plain text and whether technical access options can be ruled out.
Typical risk dimensions in the area of digital signatures are
Potential content analysis: Document content can potentially be analysed, e.g. through automated processing or scanning.
Cloud setups and jurisdiction: Additional risks arise from jurisdiction and access obligations, especially when data is processed or stored in cloud environments.
Audit and compliance complexity: Audits and compliance checks become more complex if technical access options are not excluded. Even if processes are clearly defined internally.
For decision-makers, this means that as soon as sensitive document types or data are involved, the security model belongs in the “must-have” criteria of a vendor evaluation, not in the “nice to have” discussion.
Two illustrative mini-scenes: Where risk becomes practically relevant
The following mini-scenes serve as a brief classification of why the topic is not theoretical, but is decided in real workflows.
Mini-scene 1: Healthcare – patient data / e-prescriptions
Workflows in the healthcare sector often involve patient data or e-prescriptions. Even the potential possibility of documents being processed on the server side or being available in plain text at times changes the risk assessment. This not only affects data protection issues, but also governance: Who can technically exclude access? How can this be tracked in the audit?
Mini-scene 2: Finance – Credit agreement
A credit agreement is a highly sensitive document that is typically processed in regulated processes. If a signature solution is structured in such a way that technical access options to document content are not excluded, this increases the coordination effort between security, compliance and procurement. This in turn shifts the decision from a comparison of functions to a structured risk and control assessment.
Additional relevance for other document types
Even beyond these two industry examples, there are document types that quickly illustrate the scope:
NDA: Confidentiality is the purpose and requirement of the document.
Procurement documents: Traceability and robust controls are key, especially in the public sector.
The security model check: You need to set these criteria in the evaluation
As described above, the “security model question” is an important, if not decisive, mandatory point in your vendor evaluation. Use the following criteria to put the security model to the test:
Catalogue of criteria:
- Plain text risk: Are documents available in plain text – even temporarily?
- Access options: Does the provider have technical access options?
- Document life cycle: How are documents stored, processed and deleted?
- Cloud/jurisdiction: How do cloud setups and jurisdiction affect governance and procurement?
- Auditability: Is traceability possible without requiring access to content?
These questions help to de-emotionalise the discussion: It is not about “trust”, but about a verifiable security model for digital signatures.
Minimise risks with Privacy-First and Zero Document Knowledge (ZDK)
A privacy-first approach, which views the electronic signature in terms of content protection, is not an additional function in sensitive environments, but a basic requirement. The aim is not only to “regulate” structural access options in organisational terms, but also to avoid them architecturally.
One approach to this is Zero Document Knowledge (ZDK). The key point is that the architecture aims to eliminate access options.
What does that mean?
- End-to-end encryption is used.
- Documents remain under the control of the customer and are processed locally (as opposed to server-side processing) – only hash keys are transferred.
- The security level applies in the scenarios described if certain conditions are met, e.g. password protection when using the WebApp or control via an API of the customer.
If you would like to explore the principle in more depth (as an architecture and sovereignty concept), you will find the appropriate categorisation under Zero Document Knowledge.
Classic architecture vs. privacy-first – orientation guide & comparison
| Dimension | Classic eSignature architecture | Privacy-first / ZDK approach |
|---|---|---|
| Document processing | Server-side processing possible; documents can be temporarily available in accessible environments | Local processing; documents remain under the customer’s control |
| Access options | Technical access options cannot be excluded | Access options should be eliminated architecturally |
| Cloud/Jurisdiction | Additional risks possible due to jurisdiction & access obligations | Control and sovereignty model takes centre stage |
| Audit/Compliance | Examination of complex, if access possibilities are not excluded | Traceability without access to content as a goal |
| Evaluation logic | Focus often on UX/functions | Focus on verifiable security criteria and control model |
Partner perspective: Why the security model is becoming a portfolio topic
In the partner context, it is rarely just a single tool that is evaluated. It is often about platform or portfolio logic: Which signature component will be part of an offering that will later be used in sensitive workflows?
This is precisely why the security model is also a differentiation and procurement criterion. Partners must not only “deliver functions”, but also be able to reliably explain how loss of control, jurisdiction and access options are taken into account in the model.
In this context, it can also be relevant whether a solution is integrated as a white label or embedded in existing applications.
With white-labelled models in particular, the service appears to end users as part of the provider’s own offering. This also shifts expectations: customers assume that the provider not only controls the interface, but also the underlying security architecture.
The question of the security model is therefore not a marketing issue, but a governance and trust issue (brand experience, process continuity, control points, embedding in existing security logic).
A neutral categorisation with more details can be found under White Label Solution.
Conclusion: Privacy-First is not an extra, but the basis
Electronic signatures are standard in many processes. However, standard does not automatically mean “low-risk”. In sensitive environments, the central question is not decided by convenience, but by the security model: are documents available in plain text, are there technical access options, how do cloud/jurisdiction affect governance, and how auditable is the whole thing without content access?
Privacy first is not an extra, but the basis for resilient signature processes. Zero document knowledge is the principle that is intended to architecturally eliminate access options and thus address the structural core of the risk.
