Series on COVID-19 Contact Tracing Apps Part 2: The EDPB Guideline on the Use of Contact Tracing Tools

25. May 2020

Today we are continuing our miniseries on contact tracing apps and data protection with Part 2 of the series: The EDPB Guideline on the Use of Contact Tracing Tools. As mentioned in Part 1 of our miniseries, many Member States of the European Union have started to discuss using modern technologies to combat the spread of the Coronavirus. Now, the European Data Protection Board (“EDPB”) has issued a new guideline on the use of contact tracing tools in order to give European policy makers guidance on Data Protection concerns before implementing these tools.

The Legal Basis for Processing

In its guideline, the EDPB proposes that the most relevant legal basis for the processing of personal data using contact tracing apps will probably be the necessity for the performance of a task in the public interest, i.e. Art. 6 para. 1 lit. e) GDPR. In this context, Art. 6 para. 3 GDPR clarifies that the basis for the processing referred to in Art. 6 para. 1 lit. e) GDPR shall be laid down by Union or Members State law.

Another possible legal basis for processing could be consent pursuant to Art. 6 para. 1 lit. a) GDPR. However, the controller will have to ensure that the strict requirements for consent to be valid are met.

If the contact tracing application is specifically processing sensitive data, like health data, processing could be based on Art. 9 para. 2 lit. i) GDPR for reasons of public interest in the area of public health or on Art. 9 para. 2 lit. h) GDPR for health care purposes. Otherwise, processing may also be based on explicit consent pursuant to Art. 9 para. 2 lit. a) GDPR.

Compliance with General Data Protection Principles

The guideline is a prime example of the EDPB upholding that any data processing technology must comply with the general data protection principles which are stipulated in Art. 5 GDPR. Contact tracing technology will not be an exeption to this general rule. Thus, the guideline contains recommendations on what national governments and health agencies will need to be aware of in order to observe the data protection principles.

Principle of Lawfulness, fairness and transparency, Art. 5 para. 1 lit. a) GDPR: First and foremost, the EDPB points out that the contact tracing technology must ensure compliance with GDPR and Directive 2002/58/EC (the “ePrivacy Directive”). Also, the application’s algorithms must be auditable and should be regularly reviewed by independent experts. The application’s source code should be made publicly available.

Principle of Purpose limitation, Art. 5 para. 1 lit. b) GDPR: The national authorities’ purposes of processing personal data must be specific enough to exclude further processing for purposes unrelated to the management of the COVID-19 health crisis.

Principles of Data minimisation and Data Protection by Design and by Default, Art. 5 para. 1 lit. c) and Art. 25 GDPR:

  • Data processed should be reduced to the strict minimum. The application should not collect unrelated or unnecessary information, which may include civil status, communication identifiers, equipment directory items, messages, call logs, location data, device identifiers, etc.;
  • Contact tracing apps do not require tracking the location of individual users. Instead, proximity data should be used;
  • Appropriate measures should be put in place to prevent re-identification;
  • The collected information should reside on the terminal equipment of the user and only the relevant information should be collected when absolutely necessary.

Principle of Accuracy, Art. 5 para. 1 lit. d) GDPR: The EDPB advises that procedures and processes including respective algorithms implemented by the contact tracing apps should work under the strict supervision of qualified personnel in order to limit the occurrence of any false positives and negatives. Moreover, the applications should include the ability to correct data and subsequent analysis results.

Principle of Storage limitation, Art. 5 para. 1 lit. e) GDPR: With regards to data retention mandates, personal data should be kept only for the duration of the COVID-19 crisis. The EDPB also recommends including, as soon as practicable, the criteria to determine when the application shall be dismantled and which entity shall be responsible and accountable for making that determination.

Principle of Integrity and confidentiality, Art. 5 para. 1 lit. f) GDPR: Contact tracing apps should incorporate appropriate technical and organisational measures to ensure the security of processing. The EDPB places special emphasis on state-of-the-art cryptographic techniques which should be implemented to secure the data stored in servers and applications.

Principle of Accountability, Art. 5 para. 2 GDPR: To ensure accountability, the controller of any contact tracing application should be clearly defined. The EDPB suggests that national health authorities could be the controllers. Because contact tracing technology involves different actors in order to work effectively, their roles and responsibilities must be clearly established from the outset and be explained to the users.

Functional Requirements and Implementation

The EDPB also makes mention of the fact that the implementations for contact tracing apps may follow a centralised or a decentralised approach. Generally, both systems use Bluetooth signals to log when smartphone owners are close to each other.  If one owner was confirmed to have contracted COVID-19, an alert can be sent to other owners they may have infected. Under the centralised version, the anonymised data gathered by the app will be uploaded to a remote server where matches are made with other contacts. Under the decentralised version, the data is kept on the mobile device of the user, giving users more control over their data. The EDPB does not give a recommendation for using either approach. Instead, national authorities may consider both concepts and carefully weigh up the respective effects on privacy and the possible impacts on individuals rights.

Before implementing contact tracing apps, the EDPB also suggests that a Data Protection Impact Assessment (DPIA) must be carried out as the processing is considered likely high risk (health data, anticipated large-scale adoption, systematic monitoring, use of new technological solution). Furthermore, they strongly recommend the publication of DPIAs to ensure transparency.

Lastly, the EDPB proposes that the use of contact tracing applications should be voluntary and reiterates that it should not rely on tracing individual movements but rather on proximity information regarding users.

Outlook

The EDPB acknowledges that the systematic and large scale monitoring of contacts between natural persons is a grave intrusion into their privacy. Therefore, Data Protection is indispensable to build trust, create the conditions for social acceptability of any solution, and thereby guarantee the effectiveness of these measures. It further underlines that public authorities should not have to choose between an efficient response to the current pandemic and the protection of fundamental rights, but that both can be achieved at the same time.

In the third part of the series regarding COVID-19 contact tracing apps, we will take a closer look into the privacy issues that countries are facing when implementing contact tracing technologies.