“In the public interest”: The privacy implications of international business-to-business sharing of cyber-threat intelligence

In this article, the authors examine whether static and dynamic IP addresses are “personal data” as defined in the GDPR and its predecessor the 1995 Directive that is currently the model for data protection in many jurisdictions outside Europe. The authors then consider whether sharing of that data by a business without the consent of the data subject, can be justified in the public interest so as to override individual rights under Articles 7 and 8(1) of the Charter of Fundamental Rights of the European Union, which underpin EU data protection. The analysis shows that the sharing of cyber threat intelligence is in the public interest so as to override the rights of a data subject, as long as it is carried out in ways that are strictly necessary in order to achieve security objectives. The article concludes by summarizing the project findings to date, and how they inform international sharing of cyber-threat intelligence within the private sector.