Cryptology ePrint Archive: Report 2021/394

Quantum Encryption with Certified Deletion: Public Key and Attribute-Based

Ryo Nishimaki and Takashi Yamakawa

Abstract: Broadbent and Islam (TCC '20) proposed a quantum cryptographic primitive called quantum encryption with certified deletion. In this primitive, a receiver in possession of a quantum ciphertext can generate a classical certificate that the encrypted message is deleted. Though they proved that their construction is information theoretically secure, a drawback is that the construction is limited to the setting of one-time symmetric key encryption (SKE) where a sender and receiver have to share a common key in advance and the key can be used only once. In this paper, we construct a (reusable-key) public key encryption (PKE) and attribute-based encryption (ABE) with certified deletion. Our PKE with certified deletion is constructed assuming the existence of IND-CPA secure PKE, and our ABE with certified deletion is constructed assuming the existence of indistinguishability obfuscation and one-way function.

Category / Keywords: foundations / certified deletion, public key encryption, attribute-based encryption

Date: received 24 Mar 2021, last revised 24 Mar 2021

Contact author: ryo nishimaki zk at hco ntt co jp,takashi yamakawa ga@hco ntt co jp,ryo nishimaki@gmail com

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Version: 20210327:071503 (All versions of this report)

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