On the Security of a Code-Based PIR Scheme

Kurzfassung

Private Information Retrieval (PIR) schemes enable clients to re trieve files from a database without revealing the identity of the re quested file to the server. In this paper, we prove a critical vulnerabil ity in the code-based PIR scheme CB-cPIR. Beyond theoretical anal ysis and an implementation of the attack, we evaluate the CB-cPIR scheme with adjusted parameters against state-of-the-art alternatives and demonstrate that it is no longer competitive.