1. An efficient, stateless `hash-and-sign' signature scheme in the *standard model* (i.e., no random oracles), and
2. The first *hierarchical* identity-based encryption (HIBE) scheme (also in the standard model) that does not rely on bilinear pairings.
Interestingly, the abstract properties of bonsai trees seem to have no known realization in conventional number-theoretic cryptography.
Category / Keywords: public-key cryptography / lattice-based cryptography, signatures, identity-based encryption Date: received 19 Jul 2009, last revised 1 Dec 2010 Contact author: cpeikert at alum mit edu Available formats: PDF | BibTeX Citation Note: Subsumed by merged paper (with ePrint report 2009/351) appearing in Eurocrypt 2010; full version in ePrint report 2010/591. Version: 20101202:024606 (All versions of this report) Discussion forum: Show discussion | Start new discussion