PILLAR: Private Inverted-Index Lexical Lookup for Augmented Retrieval
Retrieval-augmented generation (RAG) hands the user's query to whoever hosts the corpus. We propose PILLAR, a Privacy-Preserving RAG (PPRAG) system based on Private Information Retrieval (PIR) in which a client utilizes the k documents most similar to their query from a server-held and publicly known corpus to respond...
Truong Son Nguyen, D. Blackley, Ni Trieu et al.
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