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- W4317928310 abstract "Secure software leasing is a quantum cryptographic primitive that enables us to lease software to a user by encoding it into a quantum state. Secure software leasing has a mechanism that verifies whether a returned software is valid or not. The security notion guarantees that once a user returns a software in a valid form, the user no longer uses the software. In this work, we introduce the notion of secret-key functional encryption (SKFE) with secure key leasing, where a decryption key can be securely leased in the sense of secure software leasing. We also instantiate it with standard cryptographic assumptions. More specifically, our contribution is as follows. Some previous secure software leasing schemes capture only pirate software that runs on an honest evaluation algorithm (on a legitimate platform). However, our secure key leasing notion captures arbitrary attack strategies and does not have such a limitation. As an additional contribution, we introduce the notion of single-decryptor FE (SDFE), where each functional decryption key is copy-protected. Since copy-protection is a stronger primitive than secure software leasing, this notion can be seen as a stronger cryptographic primitive than FE with secure key leasing. More specifically, our additional contribution is as follows." @default.
- W4317928310 created "2023-01-25" @default.
- W4317928310 creator A5021254385 @default.
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- W4317928310 date "2022-01-01" @default.
- W4317928310 modified "2023-09-29" @default.
- W4317928310 title "Functional Encryption with Secure Key Leasing" @default.
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- W4317928310 doi "https://doi.org/10.1007/978-3-031-22972-5_20" @default.
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