Olga Ohrimenko

The Pyramid Scheme: Oblivious RAM for Trusted Processors

2017 · arXiv (Cornell University)

Modern processors, e.g., Intel SGX, allow applications to isolate secret code and data in encrypted memory regions called enclaves. While encryption effectively hides the contents of memory, the sequence of address references issued by the …

Elephants Do Not Forget: Differential Privacy with State Continuity for Privacy Budget

2024 · arXiv (Cornell University)

Current implementations of differentially-private (DP) systems either lack support to track the global privacy budget consumed on a dataset, or fail to faithfully maintain the state continuity of this budget. We show that failure to …