Paper 2020/798

Superposition Attack on OT Protocols

Ehsan Ebrahimi and Céline Chevalier and Marc Kaplan and Michele Minelli

Abstract

In this note, we study the security of oblivious transfer protocols in the presence of adversarial superposition queries. We define a security notion for the sender against a corrupted receiver that makes a superposition query. We present an oblivious transfer protocol that is secure against a quantum receiver restricted to a classical query but it is insecure when the receiver makes a quantum query. In addition, we present an OT protocol that resists to the attack presented in this paper. However, we leave presenting a security proof for this protocol as a direction for the future work.

Note: Affiliation change and minor changes.