2015 | OriginalPaper | Buchkapitel
One-Round Key Exchange with Strong Security: An Efficient and Generic Construction in the Standard Model
verfasst von : Florian Bergsma, Tibor Jager, Jörg Schwenk
Erschienen in: Public-Key Cryptography -- PKC 2015
Verlag: Springer Berlin Heidelberg
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One-round authenticated key exchange (ORKE) is an established research area, with many prominent protocol constructions like HMQV (Krawczyk, CRYPTO 2005) and Naxos (La Macchia
et al.
, ProvSec 2007), and many slightly different, strong security models. Most constructions combine ephemeral and static Diffie-Hellman Key Exchange (DHKE), in a manner often closely tied to the underlying security model.
We give a generic construction of ORKE protocols from general assumptions, with security in the standard model, and in a strong security model where the attacker is even allowed to learn the randomness or the long-term secret of either party in the target session. The only restriction is that the attacker must not learn
both
the randomness
and
the long-term secret of one party of the target session, since this would allow him to recompute all internal states of this party, including the session key.
This is the first such construction that does not rely on random oracles. The construction is intuitive, relatively simple, and efficient. It uses only standard primitives, namely non-interactive key exchange, a digital signature scheme, and a pseudorandom function, with standard security properties, as building blocks.