Blar i Institutt for matematiske fag på tidsskrift "Journal of Cryptology"

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    • Compact Structure-Preserving Signatures with Almost Tight Security 

      Abe, Masayuki; Hofheinz, Dennis; Nishimaki, Ryo; Ohkubo, Miyako; Pan, Jiaxin (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 

      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 ...

    • Tightly Secure Hierarchical Identity-Based Encryption 

      Langrehr, Roman; Pan, Jiaxin (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 ...