Uncloneable Encryption, Revisited

03/27/2021

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by   Prabhanjan Ananth, et al.

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Uncloneable encryption, introduced by Broadbent and Lord (TQC'20), is an encryption scheme with the following attractive feature: an adversary cannot create multiple ciphertexts which encrypt to the same message as the original ciphertext. The constructions proposed by Broadbent and Lord have the disadvantage that they only guarantee one-time security; that is, the encryption key can only be used once to encrypt the message. In this work, we study uncloneable encryption schemes, where the encryption key can be re-used to encrypt multiple messages. We present two constructions from minimal cryptographic assumptions: (i) a private-key uncloneable encryption scheme assuming post-quantum one-way functions and, (ii) a public-key uncloneable encryption scheme assuming a post-quantum public-key encryption scheme.