A Demonstration of PKGem: Secure Enrichment of Personal Knowledge Graphs

We present PKGem, a system that provides an end-to-end secure solution to enrich personal knowledge graphs in mobile environments. This task faces two core challenges: First, the proprietary, user-centric, and locally stored nature of personal knowledge graphs makes collaborative enrichment with socially connected peers a privacy concern. Moreover, the mobile environment has strict constraints on resource and computation cost, requiring lightweight and efficient design. PKGem addresses both challenges by leveraging cryptographic techniques to enable secure data enrichment across personal knowledge graphs, while remaining practical under mobile constraints. The system is implemented as an Android application and supports a variety of real-world usage scenarios. The code of PKGem is available at https://github.com/golden-eggs-lab/pkgem, with a demonstration video link included in the repository.