Blar i NTNU Open på forfatter "Langrehr, Roman"

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    • Hierarchical Identity-Based Encryption with Tight Multi-challenge Security 

      Langrehr, Roman; Pan, Jiaxin (Peer reviewed; Journal article, 2020)
      We construct the first hierarchical identity-based encryption (HIBE) scheme with tight adaptive security in the multi-challenge setting, where adversaries are allowed to ask for ciphertexts for multiple adaptively chosen ...

    • 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 ...

    • Unbounded HIBE with Tight Security 

      Langrehr, Roman; Pan, Jiaxin (Peer reviewed; Journal article, 2020)
      We propose the first tightly secure and unbounded hierarchical identity-based encryption (HIBE) scheme based on standard assumptions. Our main technical contribution is a novel proof strategy that allows us to tightly ...