Token-Based Multi-input Functional Encryption
| Autor: | Yutaka Kawai, Nuttapong Attrapadung, Koseki Yoshihiro, Jacob C. N. Schuldt, Goichiro Hanaoka, Takato Hirano |
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| Rok vydání: | 2018 |
| Předmět: |
Scheme (programming language)
Theoretical computer science Computer science business.industry 020206 networking & telecommunications 02 engineering and technology Security token Encryption Public-key cryptography Pseudorandom function family Set (abstract data type) 0202 electrical engineering electronic engineering information engineering Key (cryptography) 020201 artificial intelligence & image processing business computer computer.programming_language Functional encryption |
| Zdroj: | Provable Security ISBN: 9783030014452 ProvSec |
| Popis: | In this paper, we put forward the notion of a token-based multi-input functional encryption (token-based MIFE) scheme – a notion intended to give encryptors a mechanism to control the decryption of encrypted messages, by extending the encryption and decryption algorithms to additionally use tokens. The basic idea is that a decryptor must hold an appropriate decryption token in addition to his secrete key, to be able to decrypt. This type of scheme can address security concerns potentially arising in applications of functional encryption aimed at addressing the problem of privacy preserving data analysis. We firstly formalize token-based MIFE, and then provide two basic schemes based on an ordinary MIFE scheme and a public key encryption scheme and a pseudorandom function (PRF), respectively. Lastly, we extend the latter construction to allow decryption tokens to be restricted to specified set of encryptions, even if all encryptions have been done using the same encryption token. This is achieved by using a constrained PRF. |
| Databáze: | OpenAIRE |
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