Browsing Institutt for matematiske fag by Journals "Journal of Cryptology"
Now showing items 1-3 of 3
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Compact Structure-Preserving Signatures with Almost Tight Security
(Peer reviewed; Journal article, 2023)In structure-preserving cryptography, every building block shares the same bilinear groups. These groups must be generated for a specific, a priori fixed security level, and thus, it is vital that the security reduction ... -
Signed (Group) Diffie–Hellman Key Exchange with Tight Security
(Peer reviewed; Journal article, 2022)We propose the first tight security proof for the ordinary two-message signed Diffie–Hellman key exchange protocol in the random oracle model. Our proof is based on the strong computational Diffie–Hellman assumption and ... -
Tightly Secure Hierarchical Identity-Based Encryption
(Peer reviewed; Journal article, 2020)We construct the first tightly secure hierarchical identity-based encryption (HIBE) scheme based on standard assumptions, which solves an open problem from Blazy, Kiltz, and Pan (CRYPTO 2014). At the core of our constructions ...