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arXiv · 1907.00935

One-Time Programs made Practical

Lianying Zhao·Joseph I. Choi·Didem Demirag·Kevin R. B. Butler·Mohammad Mannan·Erman Ayday·Jeremy Clark
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Abstract

A one-time program (OTP) works as follows: Alice provides Bob with the implementation of some function. Bob can have the function evaluated exclusively on a single input of his choosing. Once executed, the program will fail to evaluate on any other input. State-of-the-art one-time programs have remained theoretical, requiring custom hardware that is cost-ineffective/unavailable, or confined to adhoc/unrealistic assumptions. To bridge this gap, we explore how the Trusted Execution Environment (TEE) of modern CPUs can realize the OTP functionality. Specifically, we build two flavours of such a system: in the first, the TEE directly enforces the one-timeness of the program; in the second, the program is represented with a garbled circuit and the TEE ensures Bob's input can only be wired into the circuit once, equivalent to a smaller cryptographic primitive called one-time memory. These have different performance profiles: the first is best when Alice's input is small and Bob's is large, and the second for the converse.

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Lianying Zhao, Joseph I. Choi, Didem Demirag, Kevin R. B. Butler, Mohammad Mannan, Erman Ayday, Jeremy Clark. 2019-07-01. One-Time Programs made Practical. https://arxiv.org/abs/1907.00935

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