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- research-articleJuly 2024
Tightly secure (H)IBE in the random oracle model
AbstractWe present an adaptively secure identity-based encryption (IBE) scheme with constant sized parameters and constant security loss in multi-instance multi-ciphertext (MIMC) setting in prime-order groups, in the random oracle model. We then further ...
- letterJanuary 2024
- ArticleDecember 2023
Improved Fully Adaptive Decentralized MA-ABE for NC1 from MDDH
AbstractWe improve the first and the only existing prime-order fully adaptively secure decentralized Multi-Authority Attribute-Based Encryption (MA-ABE) scheme for NC1 in Datta-Komargodski-Waters [Eurocrypt ’23]. Compared with Datta-Komargodski-Waters, ...
- research-articleNovember 2023
Inner-Product Matchmaking Encryption: Bilateral Access Control and Beyond Equality
We present an inner-product matchmaking encryption (IP-ME) scheme achieving weak privacy and authenticity in prime-order groups under symmetric external Diffie–Hellman (SXDH) assumption in the standard model. We further present an IP-ME with Monotone Span ...