Blar i Institutt for matematiske fag på forfatter "Jager, Tibor"

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    • Authenticated Key Exchange and Signatures with Tight Security in the Standard Model 

      Han, Shuai; Jager, Tibor; Kiltz, Eike; Liu, Shengli; Pan, Jiaxin; Riepel, Doreen; Schäge, Sven (Peer reviewed; Journal article, 2021)
      We construct the first authenticated key exchange protocols that achieve tight security in the standard model. Previous works either relied on techniques that seem to inherently require a random oracle, or achieved only ...

    • Highly Efficient Key Exchange Protocols with Optimal Tightness 

      Cohn-Gordon, Katriel; Cremers, Cas; Gjøsteen, Kristian; Jacobsen, Håkon; Jager, Tibor (Journal article; Peer reviewed, 2019)
      In this paper we give nearly tight reductions for modern implicitly authenticated Diffie-Hellman protocols in the style of the Signal and Noise protocols, which are extremely simple and efficient. Unlike previous approaches, ...

    • On Optimal Tightness for Key Exchange with Full Forward Secrecy via Key Confirmation 

      Gellert, Kai; Gjøsteen, Kristian; Jacobsen, Håkon; Jager, Tibor (Journal article; Peer reviewed, 2023)
      A standard paradigm for building key exchange protocols with full forward secrecy (and explicit authentication) is to add key confirmation messages to an underlying protocol having only weak forward secrecy (and implicit ...

    • Practical and tightly-secure digital signatures and authenticated key exchange 

      Gjøsteen, Kristian; Jager, Tibor (Journal article; Peer reviewed, 2018)
      Tight security is increasingly gaining importance in real-world cryptography, as it allows to choose cryptographic parameters in a way that is supported by a security proof, without the need to sacrifice efficiency by ...