Cryptology ePrint Archive: Report 2015/1210

Quantum Security of the Fujisaki-Okamoto and OAEP Transforms

Ehsan Ebrahimi Targhi and Dominique Unruh

Abstract: In this paper, we present a hybrid encryption scheme that is chosen ciphertext secure in the quantum random oracle model. Our scheme is a combination of an asymmetric and a symmetric encryption scheme that are secure in a weak sense. It is a slight modification of the Fujisaki-Okamoto transform that is secure against classical adversaries. In addition, we modify the OAEP-cryptosystem and prove its security in the quantum random oracle model based on the existence of a partial-domain one-way injective function secure against quantum adversaries.

Category / Keywords: Quantum, Random oracle, Indistinguishability against chosen ciphertext attack.

Date: received 17 Dec 2015

Contact author: ehsan ebrahimi targhi at ut ee

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Version: 20151219:175004 (All versions of this report)

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