[Resource Topic] 2024/863: Length Leakage in Oblivious Data Access Mechanisms

Welcome to the resource topic for 2024/863

Title:
Length Leakage in Oblivious Data Access Mechanisms

Authors: Grace Jia, Rachit Agarwal, Anurag Khandelwal

Abstract:

We explore the problem of preventing length leakage in oblivious data access mechanisms with passive persistent adversaries. Designing mechanisms that prevent both access pattern and length leakage requires navigating a three-way tradeoff between storage footprint, bandwidth footprint, and the information leaked to the adversary. We establish powerful lower bounds on achievable storage and bandwidth footprints for a variety of leakage profiles, and present constructions that perfectly or near-perfectly match the lower bounds.

ePrint: https://eprint.iacr.org/2024/863

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