Identity-Based (Lossy) Trapdoor Functions and Applications

@inproceedings{Bellare2012IdentityBasedT,
  title={Identity-Based (Lossy) Trapdoor Functions and Applications},
  author={Mihir Bellare and Eike Kiltz and Chris Peikert and Brent Waters},
  booktitle={EUROCRYPT},
  year={2012}
}
We provide the first constructions of identity-based (injective) trapdoor functions. Furthermore, they are lossy. Constructions are given both with pairings (DLIN) and lattices (LWE). Our lossy identity-based trapdoor functions provide an automatic way to realize, in the identity-based setting, many functionalities previously known only in the public-key setting. In particular we obtain the first deterministic and efficiently searchable IBE schemes and the first hedged IBE schemes, which… CONTINUE READING

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