Cryptology ePrint Archive: Report 2020/798

Superposition Attack on OT Protocols

Ehsan Ebrahimi and CÚline 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.

Category / Keywords: cryptographic protocols / Oblivious Transfer, Post-Quantum Security, Superposition Attack

Date: received 26 Jun 2020, last revised 1 Jul 2020

Contact author: ehsan ebrahimi at uni lu

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Note: Affiliation change and minor changes.

Version: 20200701:082226 (All versions of this report)

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