The Importance of Email Server Security and Invoice Encryption for GDPR Compliance

I have recently successfully represented clients in several cases affected by security breaches in email traffic. A recent judgment clearly demonstrates the critical importance of ensuring the security of email servers and, in particular, the encryption of invoices. This issue is highly significant as it impacts not only the confidentiality of business data but also poses substantial financial risks.

I have previously reported on the dangers of fake invoices and false IBAN transfers in multiple articles on itmedialaw.com. For instance, I've covered cases and rulings such as a ruling by the Schleswig-Holstein Higher Regional Court on liability for falsified e-mails with invoices. These incidents highlight that both companies and private individuals can suffer from the consequences of inadequate security measures.

Email server security is a pivotal concern in today's business landscape. Without proper security protocols, sensitive data can easily fall into the wrong hands, leading to significant financial losses. A recent ruling by the Braunschweig Regional Court (case number 7 O 47/24), where I successfully represented the plaintiff, underscored that transmitting invoices and personal data via unencrypted emails can have serious legal ramifications.

Legal Consequences of Inadequate Email Security

In the aforementioned case, a purchase contract was sent via email, and the defendant's bank details were manipulated. The plaintiff subsequently transferred the purchase price to a fraudulent account, resulting in considerable financial damage. The court determined that the defendant had breached the GDPR by failing to take sufficient security measures. Specifically, the defendant did not implement transport or end-to-end encryption when sending the emails, which was deemed insufficient.

The court found that measures like antivirus software and firewalls were inadequate for data protection in this context. It emphasized that email encryption is a fundamental protection, considered a minimum requirement to meet legal obligations. The full judgment is publicly available for review.

As the plaintiff's lawyer, I successfully demonstrated the defendant's breach of GDPR obligations. The court's decision highlights the importance of accountability and the necessity of appropriate security measures in email communication. Businesses must acknowledge these challenges and implement robust protections for their own data and that of their customers. Should you have questions or require assistance, please do not hesitate to contact me.

The court concluded that the defendant culpably violated GDPR provisions by processing the plaintiff's personal data without adequate protection. The plaintiff's claim for damages stemmed from Art. 82 para. 1 GDPR, which grants individuals the right to compensation for material or non-material damage due to a GDPR breach. The plaintiff fulfilled all prerequisites for this claim, and the court found the defendant negligent for not implementing sufficient security.

The court concurred with the plaintiff that the defendant violated Articles 5, 24, and 32 GDPR. These articles mandate appropriate technical and organizational measures to ensure the protection level of personal data. Sending unencrypted invoices via email, which contains personal data, constitutes processing under Art. 4 No. 2 GDPR.

The defendant failed to even apply the lower standard of transport encryption, sending emails without any encryption whatsoever. This was deemed entirely unsuitable under GDPR. Measures like firewalls, antivirus programs, and Outlook password encryption offer no protective effect for business email transmission and are considered inadequate for personal data protection in email traffic.

The court stressed the defendant's culpability. Following European Court of Justice (ECJ) jurisprudence, Art. 82 GDPR establishes a liability regime where the burden of proof rests with the controller, not the injured party. The controller must prove they fulfilled all duties of care and were not negligent. The defendant failed to provide this proof, as necessary encryption or other sufficient security measures were absent.

Furthermore, the court ruled that the defendant violated the accountability obligation under Art. 5 para. 2 GDPR. The defendant could not demonstrate that its security measures adequately protected personal data according to GDPR standards. The ECJ interprets Art. 32 GDPR to mean that national courts must assess the suitability of controller measures by considering processing risks. Here, the defendant's measures were found insufficient to protect the plaintiff's personal data.

The court agreed that the damage of EUR 22,600 was a direct consequence of the GDPR breach. Since the defendant did not provide sufficient protection for the plaintiff's personal data when sending the contractual document via email, the defendant was required to prove the damage was not caused by its misconduct. This proof was not provided.

While the action was initially based on Section 280 BGB, the underlying legal issues are largely comparable. However, the standard of care under Art. 82 GDPR is much stricter; even minor negligence can trigger a claim for damages. Due to these higher requirements, the claim ultimately relied on Art. 82 GDPR, though similar liability could also be derived from Section 280 BGB.

Challenges with Electronic Invoices (E-Invoices)

A specific challenge arises with e-invoices, particularly those in XML format. Detecting manipulated documents can be difficult because XML files are not as easily verifiable for changes as PDFs. This significantly increases the risk of fraud and misuse. Companies must therefore exercise particular caution when using e-invoices, ensuring all transmitted data is adequately protected.

Although XML formats offer efficiency, they carry risks due to their susceptibility to manipulation. When large sums are transferred, additional security measures are crucial to prevent misuse. The GDPR mandates that personal data must be adequately protected, which includes invoice transmission. Encryption technologies can mitigate these risks and enhance data security. I have consistently highlighted the importance of secure invoice transmission in my previous articles, stressing that companies must act proactively to safeguard their customers and their own interests.

Specific Risks of XML Files

XML files offer advantages such as process automation and easy system integration. However, they are more prone to manipulation. As XML files are typically machine-readable, hackers can easily alter them without immediate detection. This can lead to significant financial losses if, for example, bank details in an invoice are changed. Companies should, therefore, ensure all XML files containing sensitive information are properly secured.

Solutions for Enhanced E-Invoice Security

Companies can adopt various strategies to minimize the risks associated with e-invoices, especially in XML format:

Encryption: Implementing encryption technologies, such as transport or end-to-end encryption, helps protect data during transmission. This is particularly vital for personal data or sensitive financial information.
Digital Signatures: Digital signatures verify the authenticity and integrity of e-invoices, aiding in the detection and prevention of manipulation.
Two-Step Authentication: Applying two-step authentication for access to systems that process e-invoices enhances protection against unauthorized access.
Regular Security Audits: Consistent security audits and penetration tests help identify and rectify system vulnerabilities before attackers can exploit them.
Staff Training: Regular training for employees raises awareness of potential risks and ensures compliance with necessary safety measures.

By implementing these measures, companies can bolster the security of their e-invoices and reduce the risk of fraud and misuse. For any questions or support on this topic, please contact me. I am dedicated to helping you protect your interests and optimize your security measures.

Conclusion: Safeguarding Your Business

The security of email servers and the encryption of invoices are fundamental to modern digital business transactions. Companies must recognize these challenges and implement appropriate measures to protect both their own data and that of their clients. The GDPR explicitly requires adequate protection of personal data, which encompasses the secure transmission of invoices. Employing encryption technologies is key to minimizing risks and ensuring data security.

The ruling by the Braunschweig Regional Court (case reference 7 O 47/24) serves as a crucial precedent, underscoring the vital role of security in email communication. It demonstrates that companies found in violation of the GDPR can face significant legal repercussions. If you are experiencing similar issues or have questions on this topic, I am available to support you. Having successfully represented clients in numerous cases, I can assist you in safeguarding your interests effectively.

P.S. My thanks, by the way, to my professional IT partner Velevo/Sebastian Genter, who provided a compelling IT report that was instrumental in this case.