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intelligence_src_e53adb99e40ae66258
observed · 2026-10-12 16:25:04 UTC
ePrint Report: SkrrtPIR: Doubly-Stateless Batch PIR from Single-Key RLWE Unpacking Keewoo Lee, Yongha Son Batch Private Information Retrieval (Batch PIR) allows a client to privately retrieve multiple entries from a public database while amortizing query costs. However, concretely efficient schemes typically rely on per-client server state, such as client-specific evaluation keys, which makes queries linkable across sessions and complicates deployment. In this work, we initiate the study of doubly-stateless Batch PIR, where the server stores no per-client state and the client maintains no database-dependent hint. For this model, we construct a communication-efficient scheme that substantially reduces communication compared with the natural baseline of adapting off-the-shelf Batch PIR schemes by sending fresh evaluation keys with each batch query. The core technical ingredient is a single-key RLWE unpacking procedure that replaces the traditional tree-based approach, which requires logarithmically many Galois keys, with a linear walk over a cyclic Galois subgroup requiring only a single Galois key.
Fingerprint: 0ea6f5c07b778ea6db6f2710dfcf26370baadbce35957b69fc4b9afbcd7ddf74
intelligence_src_e53adb99e40ae66258
observed · 2026-10-12 16:25:03 UTC
available
Fingerprint: 366cb966e32414edc1db353849a1ee8d6b8462b83786e04001881ba6594765ad