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SESSION
Keynote: Sofia Celi, Senior Cryptography Researcher, Brave
Workshop on Innovation in Metadata Privacy: Analysis and Construction Techniques (IMPACT) 2025, co-located with the Network and Distributed System Security (NDSS) Symposium 2025, held from 24 February to 28 February 2025 in San Diego, California.
https://www.ndss-symposium.org/ndss-program/impact-2025/
Keynote:
Private Information Retrieval: Foundations, Frontiers, and Future Directions for Search and Recommendation Systems
Search engines and recommendation systems are central to how we interact in the Internet, but they pose significant privacy risks. Even when they are assumed secure, information (such as search queries, click behavior, and recommendation interactions) can be used to track, profile, and infer sensitive information. Private Information Retrieval (PIR) offers a promising solution, enabling users to query and retrieve information without revealing their interests.
This talk will explore the foundations of PIR, its recent advancements, and its practical applications in search engines and recommendation systems. We will discuss how PIR can be integrated into large-scale systems while balancing efficiency and usability. We will also outline key challenges (such as deployment barriers, economic feasibility, and open research problems) that need to be addressed for PIR to become a widely adopted privacy-enhancing technology.
Speaker's Biography: Sofía Celi is a Senior Cryptography Researcher at Brave, specializing in privacy-enhancing technologies, post-quantum cryptography, and secure communication systems. She is a member of the Advisory Council at the Open Technology Fund (OTF) and holds leadership roles within the IETF, IRTF, and W3C. Sofía has also provided expert consultations for the United Nations and human rights organizations, focusing on the intersection of emerging technologies and digital rights.
As a co-founder of Criptolatinos and Women in Cryptography, Sofía is committed to fostering diversity in cryptography and security. She is actively engaged in the academic community, serving as a member of the Latincrypt Steering Committee, Publicity Co-Chair of the PETS Symposium, IACR ePrint Co-Editor, and IEEE Security & Privacy Ethics Co-Chair.
Sofía has received the Distinguished Paper Award at IEEE S&P, was a runner-up for the Best Paper Award at ESORICS and for the Pwnie Award.
Sofía lives with her amazing partner, Jurre van Bergen, and has two beloved dogs.
ABOUT NDSS SYMPOSIUM
The Network and Distributed System Security Symposium (NDSS) fosters information exchange among researchers and practitioners of network and distributed system security. The target audience includes those interested in practical aspects of network and distributed system security, with a focus on actual system design and implementation. A major goal is to encourage and enable the Internet community to apply, deploy, and advance the state of available security technologies.
https://www.ndss-symposium.org/
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