Returning to the University of Sri Jayewardenepura (USJ), Sri Lanka, for another research secondment under the ENSURE-6G MSCA Staff Exchange Programme was a rewarding experience. As a PhD researcher from Vrije Universiteit Brussel (VUB), Belgium, this visit provided another opportunity to strengthen our ongoing research collaboration, exchange knowledge, and explore emerging security challenges in future communication networks.

Exploring Post-Quantum Security for Open RAN
One of the main research objectives of this secondment was to investigate strategic Post-Quantum (PQ) migration in Open RAN-based 5G and beyond networks. As quantum computing continues to advance, ensuring the long-term security of communication networks is becoming an increasingly important research challenge.
During my stay, I had the opportunity to collaborate with researchers at USJ and exchange ideas on how existing security and authentication mechanisms could evolve towards quantum-resistant solutions. These discussions provided valuable insights into the challenges of integrating post-quantum security mechanisms into open and programmable network architectures.

Encouraging Undergraduate Research
Another meaningful activity during this secondment was collaborating with researchers from USJ to prepare a small research project proposal for undergraduate students, focusing on Open RAN and network security.
This was an opportunity to connect ongoing research with undergraduate education and encourage students to explore emerging topics in communication networks and cybersecurity. It also highlighted the importance of knowledge transfer and capacity building within the ENSURE-6G project.
Beyond Research: Strengthening Collaborations
Having previously collaborated with researchers at USJ, it was particularly rewarding to return and continue building on our existing research activities. The discussions, exchange of ideas, and opportunities to work together helped further strengthen the relationship between VUB and USJ.
The welcoming environment at USJ also made the experience particularly enjoyable. I am especially grateful to Dr. Uditha Wijewardhana, Head of the Department of Electrical and Electronic Engineering, for his kindness, guidance, and continuous support throughout my stay. His assistance helped make my secondment both productive and comfortable.

Beyond the technical activities, the secondment also provided opportunities to reconnect with colleagues and further develop professional relationships that extend beyond individual research visits.

Overall, this secondment was another valuable chapter in my ENSURE-6G research journey. I am grateful to the researchers and staff at USJ for their hospitality and support, and to VUB and the ENSURE-6G consortium for making this opportunity possible.
I look forward to continuing our collaboration and contributing to the development of secure and trustworthy Open RAN-based 5G and 6G networks.