scholarly journals Multi-Client Inner-Product Functional Encryption in the Random-Oracle Model

2020 ◽  
pp. 525-545
Author(s):  
Michel Abdalla ◽  
Florian Bourse ◽  
Hugo Marival ◽  
David Pointcheval ◽  
Azam Soleimanian ◽  
...  
Keyword(s):  
Random Oracle Model ◽  
Random Oracle ◽  
Inner Product ◽  
Functional Encryption

scholarly journals Decentralized Inner-Product Encryption with Constant-Size Ciphertext

2022 ◽  
Vol 12 (2) ◽  
pp. 636
Author(s):  
Yi-Fan Tseng ◽  
Shih-Jie Gao
Keyword(s):  
Distributed System ◽  
Single Point ◽  
Random Oracle Model ◽  
Random Oracle ◽  
Inner Product ◽  
Cryptographic Primitives ◽  
Fine Grained ◽  
Constant Size ◽  
Attribute Vector ◽  
Encryption Decryption

With the rise of technology in recent years, more people are studying distributed system architecture, such as the e-government system. The advantage of this architecture is that when a single point of failure occurs, it does not cause the system to be invaded by other attackers, making the entire system more secure. On the other hand, inner product encryption (IPE) provides fine-grained access control, and can be used as a fundamental tool to construct other cryptographic primitives. Lots of studies for IPE have been proposed recently. The first and only existing decentralized IPE was proposed by Michalevsky and Joye in 2018. However, some restrictions in their scheme may make it impractical. First, the ciphertext size is linear to the length of the corresponding attribute vector; second, the number of authorities should be the same as the length of predicate vector. To cope with the aforementioned issues, we design the first decentralized IPE with constant-size ciphertext. The security of our scheme is proven under the ℓ-DBDHE assumption in the random oracle model. Compared with Michalevsky and Joye’s work, ours achieves better efficiency in ciphertext length and encryption/decryption cost.

scholarly journals An Identity-Based Blind Signature Scheme Using Lattice with Provable Security

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Quanrun Li ◽  
Chingfang Hsu ◽  
Debiao He ◽  
Kim-Kwang Raymond Choo ◽  
Peng Gong
Keyword(s):  
Quantum Computer ◽  
Rapid Development ◽  
Random Oracle Model ◽  
Random Oracle ◽  
Mean Value ◽  
Blind Signature ◽  
Signature Scheme ◽  
Practical Applications ◽  
Universal Quantum ◽  
Identity Based

With the rapid development of quantum computing and quantum information technology, the universal quantum computer will emerge in the near decades with a very high probability and it could break most of the current public key cryptosystems totally. Due to the ability of withstanding the universal quantum computer’s attack, the lattice-based cryptosystems have received lots of attention from both industry and academia. In this paper, we propose an identity-based blind signature scheme using lattice. We also prove that the proposed scheme is provably secure in the random oracle model. The performance analysis shows that the proposed scheme has less mean value of sampling times and smaller signature size than previous schemes. Thus, the proposed scheme is more suitable for practical applications.

scholarly journals ID-based key-insulated signcryption with equality test in cloud computing

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Seth Alornyo ◽  
Kingsford Kissi Mireku ◽  
Mustapha Adamu Mohammed ◽  
Daniel Adu-Gyamfi ◽  
Michael Asante
Keyword(s):  
Cloud Computing ◽  
Random Oracle Model ◽  
Random Oracle ◽  
Harsh Environments ◽  
Secret Key ◽  
Secret Keys ◽  
Security Property ◽  
Equality Test ◽  
Chosen Ciphertext Attack ◽  
Chosen Message Attack

AbstractKey-insulated encryption reduces the problem of secret key exposure in hostile setting while signcryption cryptosystem attains the benefits of digitally signing a ciphertext and public key cryptosystem. In this study, we merge the primitives of parallel key-insulation cryptosystem and signcryption with equality test to construct ID-based parallel key-insulated signcryption with a test for equality (ID-PKSET) in cloud computing. The construction prevent data forgery, data re-play attacks and reduces the leakage of secret keys in harsh environments. Our scheme attains the security property of existential unforgeable chosen message attack (EUF-CMA) and indistinquishable identity chosen ciphertext attack (IND-ID-CCA2) using random oracle model.

Tighter Security Proofs for GPV-IBE in the Quantum Random Oracle Model

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Shuichi Katsumata ◽  
Shota Yamada ◽  
Takashi Yamakawa
Keyword(s):  
Random Oracle Model ◽  
Random Oracle ◽  
Security Proofs

Tightly CCA-Secure Inner Product Functional Encryption Scheme

2021 ◽  
Author(s):  
Xiangyu Liu ◽  
Shengli Liu ◽  
Shuai Han ◽  
Dawu Gu
Keyword(s):  
Inner Product ◽  
Encryption Scheme ◽  
Functional Encryption

Multi-input Inner-Product Functional Encryption from Pairings

2017 ◽  
pp. 601-626 ◽  
Author(s):  
Michel Abdalla ◽  
Romain Gay ◽  
Mariana Raykova ◽  
Hoeteck Wee
Keyword(s):  
Inner Product ◽  
Functional Encryption
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