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Efficient selective-id secure identity-based encryption without random oracles. (English) Zbl 1122.94355
Cachin, Christian (ed.) et al., Advances in cryptology – EUROCRYPT 2004. International conference on the theory and applications of cryptographic techniques, Interlaken, Switzerland, May 2–6, 2004. Proceedings. Berlin: Springer (ISBN 3-540-21935-8/pbk). Lecture Notes in Computer Science 3027, 223-238 (2004).
Summary: We construct two efficient Identity Based Encryption (IBE) systems that are selective identity secure without the random oracle model. Selective identity secure IBE is a slightly weaker security model than the standard security model for IBE. In this model the adversary must commit ahead of time to the identity that it intends to attack, whereas in the standard model the adversary is allowed to choose this identity adaptively. Our first secure IBE system extends to give a selective identity Hierarchical IBE secure without random oracles.
For the entire collection see [Zbl 1051.94003].

94A60 Cryptography
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