Browsing Institutt for matematiske fag by Author "Qian, Chen"
Now showing items 1-4 of 4
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Generic constructions of master-key KDM secure attribute-based encryption
Pan, Jiaxin; Qian, Chen; Wagner, Benedikt (Peer reviewed; Journal article, 2023)Master-key key-dependent message (mKDM) security is a strong security notion for attribute-based encryption (ABE) schemes, which has been investigated in recent years. This line of research was started with identity-based ... -
Signed (Group) Diffie–Hellman Key Exchange with Tight Security
Pan, Jiaxin; Qian, Chen; Ringerud, Magnus (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 ... -
Signed Diffie-Hellman Key Exchange with Tight Security
Pan, Jiaxin; Qian, Chen; Ringerud, Magnus (Peer reviewed; Journal article, 2021)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 ... -
Transferable E-cash: A Cleaner Model and the First Practical Instantiation
Bauer, Balthazar; Fuchsbauer, Georg; Qian, Chen (Journal article, 2021)Transferable e-cash is the most faithful digital analog of physical cash, as it allows users to transfer coins between them in isolation, that is, without interacting with a bank or a “ledger”. Appropriate protection of ...